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<p align='center'>
<img src='./screenshots/logo.svg' width='400'/>
</p>
<p align='center'>Collection of TypeScript type challenges</p>
<p align='center'>
<a href='https://discord.gg/UgKBCq9'>
<img src='https://img.shields.io/badge/-Discord-yellowgreen?logo=discord&logoColor=white&color=7289da'/>
</a>
<a href='https://www.typescriptlang.org/play?install-plugin=%40type-challenges%2Fplayground-plugin'>
<img src='https://img.shields.io/badge/Playground-143?logo=typescript&color=3178C6&logoColor=fff' />
</a>
</p>
<br>
<p align='center'>
English | <a href='./README.zh-CN.md'>简体中文</a> | <a href='./README.ja.md'>日本語</a> | <a href='./README.ko.md'>한국어</a>
</p>
## Intro
<p align='center'>
<del><em>by the power of TypeScript's well-known <a href="https://github.com/microsoft/TypeScript/issues/14833">Turing Completed</a> type system</em></del>
</p>
High-quality types can help improve projects' maintainability while avoiding potential bugs.
There are a bunch of awesome type utility libraries that may boost your works on types, like [ts-toolbelt](https://github.com/millsp/ts-toolbelt), [utility-types](https://github.com/piotrwitek/utility-types), [SimplyTyped](https://github.com/andnp/SimplyTyped), etc., which you can already use.
This project is aimed at helping you better understand how the type system works, writing your own utilities, or just having fun with the challenges. We are also trying to form a community where you can ask questions and get answers you have faced in the real world - they may become part of the challenges!
## Challenges
> Click the following badges to see details of the challenges.
> **Note**: Challenges works in the [strict mode](https://www.typescriptlang.org/tsconfig#strict).
<br>
<!--challenges-start-->
<img src="https://img.shields.io/badge/warm--up-1-teal" alt="1"/><br><a href="./questions/00013-warm-hello-world/README.md" target="_blank"><img src="https://img.shields.io/badge/-13%E3%83%BBHello%20World-teal" alt="13・Hello World"/></a> <br><br><img src="https://img.shields.io/badge/easy-13-7aad0c" alt="13"/><br><a href="./questions/00004-easy-pick/README.md" target="_blank"><img src="https://img.shields.io/badge/-4%E3%83%BBPick-7aad0c" alt="4・Pick"/></a> <a href="./questions/00007-easy-readonly/README.md" target="_blank"><img src="https://img.shields.io/badge/-7%E3%83%BBReadonly-7aad0c" alt="7・Readonly"/></a> <a href="./questions/00011-easy-tuple-to-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-11%E3%83%BBTuple%20to%20Object-7aad0c" alt="11・Tuple to Object"/></a> <a href="./questions/00014-easy-first/README.md" target="_blank"><img src="https://img.shields.io/badge/-14%E3%83%BBFirst%20of%20Array-7aad0c" alt="14・First of Array"/></a> <a href="./questions/00018-easy-tuple-length/README.md" target="_blank"><img src="https://img.shields.io/badge/-18%E3%83%BBLength%20of%20Tuple-7aad0c" alt="18・Length of Tuple"/></a> <a href="./questions/00043-easy-exclude/README.md" target="_blank"><img src="https://img.shields.io/badge/-43%E3%83%BBExclude-7aad0c" alt="43・Exclude"/></a> <a href="./questions/00189-easy-awaited/README.md" target="_blank"><img src="https://img.shields.io/badge/-189%E3%83%BBAwaited-7aad0c" alt="189・Awaited"/></a> <a href="./questions/00268-easy-if/README.md" target="_blank"><img src="https://img.shields.io/badge/-268%E3%83%BBIf-7aad0c" alt="268・If"/></a> <a href="./questions/00533-easy-concat/README.md" target="_blank"><img src="https://img.shields.io/badge/-533%E3%83%BBConcat-7aad0c" alt="533・Concat"/></a> <a href="./questions/00898-easy-includes/README.md" target="_blank"><img src="https://img.shields.io/badge/-898%E3%83%BBIncludes-7aad0c" alt="898・Includes"/></a> <a href="./questions/03057-easy-push/README.md" target="_blank"><img src="https://img.shields.io/badge/-3057%E3%83%BBPush-7aad0c" alt="3057・Push"/></a> <a href="./questions/03060-easy-unshift/README.md" target="_blank"><img src="https://img.shields.io/badge/-3060%E3%83%BBUnshift-7aad0c" alt="3060・Unshift"/></a> <a href="./questions/03312-easy-parameters/README.md" target="_blank"><img src="https://img.shields.io/badge/-3312%E3%83%BBParameters-7aad0c" alt="3312・Parameters"/></a> <br><br><img src="https://img.shields.io/badge/medium-75-d9901a" alt="75"/><br><a href="./questions/00002-medium-return-type/README.md" target="_blank"><img src="https://img.shields.io/badge/-2%E3%83%BBGet%20Return%20Type-d9901a" alt="2・Get Return Type"/></a> <a href="./questions/00003-medium-omit/README.md" target="_blank"><img src="https://img.shields.io/badge/-3%E3%83%BBOmit-d9901a" alt="3・Omit"/></a> <a href="./questions/00008-medium-readonly-2/README.md" target="_blank"><img src="https://img.shields.io/badge/-8%E3%83%BBReadonly%202-d9901a" alt="8・Readonly 2"/></a> <a href="./questions/00009-medium-deep-readonly/README.md" target="_blank"><img src="https://img.shields.io/badge/-9%E3%83%BBDeep%20Readonly-d9901a" alt="9・Deep Readonly"/></a> <a href="./questions/00010-medium-tuple-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BBTuple%20to%20Union-d9901a" alt="10・Tuple to Union"/></a> <a href="./questions/00012-medium-chainable-options/README.md" target="_blank"><img src="https://img.shields.io/badge/-12%E3%83%BBChainable%20Options-d9901a" alt="12・Chainable Options"/></a> <a href="./questions/00015-medium-last/README.md" target="_blank"><img src="https://img.shields.io/badge/-15%E3%83%BBLast%20of%20Array-d9901a" alt="15・Last of Array"/></a> <a href="./questions/00016-medium-pop/README.md" target="_blank"><img src="https://img.shields.io/badge/-16%E3%83%BBPop-d9901a" alt="16・Pop"/></a> <a href="./questions/00020-medium-promise-all/README.md" target="_blank"><img src="https://img.shields.io/badge/-20%E3%83%BBPromise.all-d9901a" alt="20・Promise.all"/></a> <a href="./questions/00062-medium-type-lookup/README.md" target="_blank"><img src="https://img.shields.io/badge/-62%E3%83%BBType%20Lookup-d9901a" alt="62・Type Lookup"/></a> <a href="./questions/00106-medium-trimleft/README.md" target="_blank"><img src="https://img.shields.io/badge/-106%E3%83%BBTrim%20Left-d9901a" alt="106・Trim Left"/></a> <a href="./questions/00108-medium-trim/README.md" target="_blank"><img src="https://img.shields.io/badge/-108%E3%83%BBTrim-d9901a" alt="108・Trim"/></a> <a href="./questions/00110-medium-capitalize/README.md" target="_blank"><img src="https://img.shields.io/badge/-110%E3%83%BBCapitalize-d9901a" alt="110・Capitalize"/></a> <a href="./questions/00116-medium-replace/README.md" target="_blank"><img src="https://img.shields.io/badge/-116%E3%83%BBReplace-d9901a" alt="116・Replace"/></a> <a href="./questions/00119-medium-replaceall/README.md" target="_blank"><img src="https://img.shields.io/badge/-119%E3%83%BBReplaceAll-d9901a" alt="119・ReplaceAll"/></a> <a href="./questions/00191-medium-append-argument/README.md" target="_blank"><img src="https://img.shields.io/badge/-191%E3%83%BBAppend%20Argument-d9901a" alt="191・Append Argument"/></a> <a href="./questions/00296-medium-permutation/README.md" target="_blank"><img src="https://img.shields.io/badge/-296%E3%83%BBPermutation-d9901a" alt="296・Permutation"/></a> <a href="./questions/00298-medium-length-of-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-298%E3%83%BBLength%20of%20String-d9901a" alt="298・Length of String"/></a> <a href="./questions/00459-medium-flatten/README.md" target="_blank"><img src="https://img.shields.io/badge/-459%E3%83%BBFlatten-d9901a" alt="459・Flatten"/></a> <a href="./questions/00527-medium-append-to-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-527%E3%83%BBAppend%20to%20object-d9901a" alt="527・Append to object"/></a> <a href="./questions/00529-medium-absolute/README.md" target="_blank"><img src="https://img.shields.io/badge/-529%E3%83%BBAbsolute-d9901a" alt="529・Absolute"/></a> <a href="./questions/00531-medium-string-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-531%E3%83%BBString%20to%20Union-d9901a" alt="531・String to Union"/></a> <a href="./questions/00599-medium-merge/README.md" target="_blank"><img src="https://img.shields.io/badge/-599%E3%83%BBMerge-d9901a" alt="599・Merge"/></a> <a href="./questions/00612-medium-kebabcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-612%E3%83%BBKebabCase-d9901a" alt="612・KebabCase"/></a> <a href="./questions/00645-medium-diff/README.md" target="_blank"><img src="https://img.shields.io/badge/-645%E3%83%BBDiff-d9901a" alt="645・Diff"/></a> <a href="./questions/00949-medium-anyof/README.md" target="_blank"><img src="https://img.shields.io/badge/-949%E3%83%BBAnyOf-d9901a" alt="949・AnyOf"/></a> <a href="./questions/01042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a> <a href="./questions/01097-medium-isunion/README.md" target="_blank"><img src="https://img.shields.io/badge/-1097%E3%83%BBIsUnion-d9901a" alt="1097・IsUnion"/></a> <a href="./questions/01130-medium-replacekeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-1130%E3%83%BBReplaceKeys-d9901a" alt="1130・ReplaceKeys"/></a> <a href="./questions/01367-medium-remove-index-signature/README.md" target="_blank"><img src="https://img.shields.io/badge/-1367%E3%83%BBRemove%20Index%20Signature-d9901a" alt="1367・Remove Index Signature"/></a> <a href="./questions/01978-medium-percentage-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-1978%E3%83%BBPercentage%20Parser-d9901a" alt="1978・Percentage Parser"/></a> <a href="./questions/02070-medium-drop-char/README.md" target="_blank"><img src="https://img.shields.io/badge/-2070%E3%83%BBDrop%20Char-d9901a" alt="2070・Drop Char"/></a> <a href="./questions/02257-medium-minusone/README.md" target="_blank"><img src="https://img.shields.io/badge/-2257%E3%83%BBMinusOne-d9901a" alt="2257・MinusOne"/></a> <a href="./questions/02595-medium-pickbytype/README.md" target="_blank"><img src="https://img.shields.io/badge/-2595%E3%83%BBPickByType-d9901a" alt="2595・PickByType"/></a> <a href="./questions/02688-medium-startswith/README.md" target="_blank"><img src="https://img.shields.io/badge/-2688%E3%83%BBStartsWith-d9901a" alt="2688・StartsWith"/></a> <a href="./questions/02693-medium-endswith/README.md" target="_blank"><img src="https://img.shields.io/badge/-2693%E3%83%BBEndsWith-d9901a" alt="2693・EndsWith"/></a> <a href="./questions/02757-medium-partialbykeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2757%E3%83%BBPartialByKeys-d9901a" alt="2757・PartialByKeys"/></a> <a href="./questions/02759-medium-requiredbykeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2759%E3%83%BBRequiredByKeys-d9901a" alt="2759・RequiredByKeys"/></a> <a href="./questions/02793-medium-mutable/README.md" target="_blank"><img src="https://img.shields.io/badge/-2793%E3%83%BBMutable-d9901a" alt="2793・Mutable"/></a> <a href="./questions/02852-medium-omitbytype/README.md" target="_blank"><img src="https://img.shields.io/badge/-2852%E3%83%BBOmitByType-d9901a" alt="2852・OmitByType"/></a> <a href="./questions/02946-medium-objectentries/README.md" target="_blank"><img src="https://img.shields.io/badge/-2946%E3%83%BBObjectEntries-d9901a" alt="2946・ObjectEntries"/></a> <a href="./questions/03062-medium-shift/README.md" target="_blank"><img src="https://img.shields.io/badge/-3062%E3%83%BBShift-d9901a" alt="3062・Shift"/></a> <a href="./questions/03188-medium-tuple-to-nested-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-3188%E3%83%BBTuple%20to%20Nested%20Object-d9901a" alt="3188・Tuple to Nested Object"/></a> <a href="./questions/03192-medium-reverse/README.md" target="_blank"><img src="https://img.shields.io/badge/-3192%E3%83%BBReverse-d9901a" alt="3192・Reverse"/></a> <a href="./questions/03196-medium-flip-arguments/README.md" target="_blank"><img src="https://img.shields.io/badge/-3196%E3%83%BBFlip%20Arguments-d9901a" alt="3196・Flip Arguments"/></a> <a href="./questions/03243-medium-flattendepth/README.md" target="_blank"><img src="https://img.shields.io/badge/-3243%E3%83%BBFlattenDepth-d9901a" alt="3243・FlattenDepth"/></a> <a href="./questions/03326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/03376-medium-inordertraversal/README.md" target="_blank"><img src="https://img.shields.io/badge/-3376%E3%83%BBInorderTraversal-d9901a" alt="3376・InorderTraversal"/></a> <a href="./questions/04179-medium-flip/README.md" target="_blank"><img src="https://img.shields.io/badge/-4179%E3%83%BBFlip-d9901a" alt="4179・Flip"/></a> <a href="./questions/04182-medium-fibonacci-sequence/README.md" target="_blank"><img src="https://img.shields.io/badge/-4182%E3%83%BBFibonacci%20Sequence-d9901a" alt="4182・Fibonacci Sequence"/></a> <a href="./questions/04260-medium-nomiwase/README.md" target="_blank"><img src="https://img.shields.io/badge/-4260%E3%83%BBAllCombinations-d9901a" alt="4260・AllCombinations"/></a> <a href="./questions/04425-medium-greater-than/README.md" target="_blank"><img src="https://img.shields.io/badge/-4425%E3%83%BBGreater%20Than-d9901a" alt="4425・Greater Than"/></a> <a href="./questions/04471-medium-zip/README.md" target="_blank"><img src="https://img.shields.io/badge/-4471%E3%83%BBZip-d9901a" alt="4471・Zip"/></a> <a href="./questions/04484-medium-istuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-4484%E3%83%BBIsTuple-d9901a" alt="4484・IsTuple"/></a> <a href="./questions/04499-medium-chunk/README.md" target="_blank"><img src="https://img.shields.io/badge/-4499%E3%83%BBChunk-d9901a" alt="4499・Chunk"/></a> <a href="./questions/04518-medium-fill/README.md" target="_blank"><img src="https://img.shields.io/badge/-4518%E3%83%BBFill-d9901a" alt="4518・Fill"/></a> <a href="./questions/04803-medium-trim-right/README.md" target="_blank"><img src="https://img.shields.io/badge/-4803%E3%83%BBTrim%20Right-d9901a" alt="4803・Trim Right"/></a> <a href="./questions/05117-medium-without/README.md" target="_blank"><img src="https://img.shields.io/badge/-5117%E3%83%BBWithout-d9901a" alt="5117・Without"/></a> <a href="./questions/05140-medium-trunc/README.md" target="_blank"><img src="https://img.shields.io/badge/-5140%E3%83%BBTrunc-d9901a" alt="5140・Trunc"/></a> <a href="./questions/05153-medium-indexof/README.md" target="_blank"><img src="https://img.shields.io/badge/-5153%E3%83%BBIndexOf-d9901a" alt="5153・IndexOf"/></a> <a href="./questions/05310-medium-join/README.md" target="_blank"><img src="https://img.shields.io/badge/-5310%E3%83%BBJoin-d9901a" alt="5310・Join"/></a> <a href="./questions/05317-medium-lastindexof/README.md" target="_blank"><img src="https://img.shields.io/badge/-5317%E3%83%BBLastIndexOf-d9901a" alt="5317・LastIndexOf"/></a> <a href="./questions/05360-medium-unique/README.md" target="_blank"><img src="https://img.shields.io/badge/-5360%E3%83%BBUnique-d9901a" alt="5360・Unique"/></a> <a href="./questions/05821-medium-maptypes/README.md" target="_blank"><img src="https://img.shields.io/badge/-5821%E3%83%BBMapTypes-d9901a" alt="5821・MapTypes"/></a> <a href="./questions/07544-medium-construct-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-7544%E3%83%BBConstruct%20Tuple-d9901a" alt="7544・Construct Tuple"/></a> <a href="./questions/08640-medium-number-range/README.md" target="_blank"><img src="https://img.shields.io/badge/-8640%E3%83%BBNumber%20Range-d9901a" alt="8640・Number Range"/></a> <a href="./questions/08767-medium-combination/README.md" target="_blank"><img src="https://img.shields.io/badge/-8767%E3%83%BBCombination-d9901a" alt="8767・Combination"/></a> <a href="./questions/08987-medium-subsequence/README.md" target="_blank"><img src="https://img.shields.io/badge/-8987%E3%83%BBSubsequence-d9901a" alt="8987・Subsequence"/></a> <a href="./questions/09286-medium-firstuniquecharindex/README.md" target="_blank"><img src="https://img.shields.io/badge/-9286%E3%83%BBFirstUniqueCharIndex-d9901a" alt="9286・FirstUniqueCharIndex"/></a> <a href="./questions/09896-medium-get-middle-element/README.md" target="_blank"><img src="https://img.shields.io/badge/-9896%E3%83%BBGetMiddleElement-d9901a" alt="9896・GetMiddleElement"/></a> <a href="./questions/10969-medium-integer/README.md" target="_blank"><img src="https://img.shields.io/badge/-10969%E3%83%BBInteger-d9901a" alt="10969・Integer"/></a> <a href="./questions/16259-medium-to-primitive/README.md" target="_blank"><img src="https://img.shields.io/badge/-16259%E3%83%BBToPrimitive-d9901a" alt="16259・ToPrimitive"/></a> <a href="./questions/17973-medium-deepmutable/README.md" target="_blank"><img src="https://img.shields.io/badge/-17973%E3%83%BBDeepMutable-d9901a" alt="17973・DeepMutable"/></a> <a href="./questions/18142-medium-all/README.md" target="_blank"><img src="https://img.shields.io/badge/-18142%E3%83%BBAll-d9901a" alt="18142・All"/></a> <a href="./questions/18220-medium-filter/README.md" target="_blank"><img src="https://img.shields.io/badge/-18220%E3%83%BBFilter-d9901a" alt="18220・Filter"/></a> <br><br><img src="https://img.shields.io/badge/hard-43-de3d37" alt="43"/><br><a href="./questions/00006-hard-simple-vue/README.md" target="_blank"><img src="https://img.shields.io/badge/-6%E3%83%BBSimple%20Vue-de3d37" alt="6・Simple Vue"/></a> <a href="./questions/00017-hard-currying-1/README.md" target="_blank"><img src="https://img.shields.io/badge/-17%E3%83%BBCurrying%201-de3d37" alt="17・Currying 1"/></a> <a href="./questions/00055-hard-union-to-intersection/README.md" target="_blank"><img src="https://img.shields.io/badge/-55%E3%83%BBUnion%20to%20Intersection-de3d37" alt="55・Union to Intersection"/></a> <a href="./questions/00057-hard-get-required/README.md" target="_blank"><img src="https://img.shields.io/badge/-57%E3%83%BBGet%20Required-de3d37" alt="57・Get Required"/></a> <a href="./questions/00059-hard-get-optional/README.md" target="_blank"><img src="https://img.shields.io/badge/-59%E3%83%BBGet%20Optional-de3d37" alt="59・Get Optional"/></a> <a href="./questions/00089-hard-required-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-89%E3%83%BBRequired%20Keys-de3d37" alt="89・Required Keys"/></a> <a href="./questions/00090-hard-optional-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-90%E3%83%BBOptional%20Keys-de3d37" alt="90・Optional Keys"/></a> <a href="./questions/00112-hard-capitalizewords/README.md" target="_blank"><img src="https://img.shields.io/badge/-112%E3%83%BBCapitalize%20Words-de3d37" alt="112・Capitalize Words"/></a> <a href="./questions/00114-hard-camelcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-114%E3%83%BBCamelCase-de3d37" alt="114・CamelCase"/></a> <a href="./questions/00147-hard-c-printf-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-147%E3%83%BBC--printf%20Parser-de3d37" alt="147・C-printf Parser"/></a> <a href="./questions/00213-hard-vue-basic-props/README.md" target="_blank"><img src="https://img.shields.io/badge/-213%E3%83%BBVue%20Basic%20Props-de3d37" alt="213・Vue Basic Props"/></a> <a href="./questions/00223-hard-isany/README.md" target="_blank"><img src="https://img.shields.io/badge/-223%E3%83%BBIsAny-de3d37" alt="223・IsAny"/></a> <a 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href="./questions/00472-hard-tuple-to-enum-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-472%E3%83%BBTuple%20to%20Enum%20Object-de3d37" alt="472・Tuple to Enum Object"/></a> <a href="./questions/00545-hard-printf/README.md" target="_blank"><img src="https://img.shields.io/badge/-545%E3%83%BBprintf-de3d37" alt="545・printf"/></a> <a href="./questions/00651-hard-length-of-string-2/README.md" target="_blank"><img src="https://img.shields.io/badge/-651%E3%83%BBLength%20of%20String%202-de3d37" alt="651・Length of String 2"/></a> <a href="./questions/02059-hard-drop-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-2059%E3%83%BBDrop%20String-de3d37" alt="2059・Drop String"/></a> <a href="./questions/00151-extreme-query-string-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-151%E3%83%BBQuery%20String%20Parser-b11b8d" alt="151・Query String Parser"/></a> <a href="./questions/00274-extreme-integers-comparator/README.md" target="_blank"><img src="https://img.shields.io/badge/-274%E3%83%BBIntegers%20Comparator-b11b8d" alt="274・Integers Comparator"/></a> <a href="./questions/00476-extreme-sum/README.md" target="_blank"><img src="https://img.shields.io/badge/-476%E3%83%BBSum-b11b8d" alt="476・Sum"/></a> <a href="./questions/00517-extreme-multiply/README.md" target="_blank"><img src="https://img.shields.io/badge/-517%E3%83%BBMultiply-b11b8d" alt="517・Multiply"/></a> <a href="./questions/06228-extreme-json-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-6228%E3%83%BBJSON%20Parser-b11b8d" alt="6228・JSON Parser"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23this-999" alt="#this"/></td><td><a href="./questions/00006-hard-simple-vue/README.md" target="_blank"><img src="https://img.shields.io/badge/-6%E3%83%BBSimple%20Vue-de3d37" alt="6・Simple Vue"/></a> <a href="./questions/01290-hard-pinia/README.md" target="_blank"><img src="https://img.shields.io/badge/-1290%E3%83%BBPinia-de3d37" alt="1290・Pinia"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23tuple-999" alt="#tuple"/></td><td><a href="./questions/00018-easy-tuple-length/README.md" target="_blank"><img src="https://img.shields.io/badge/-18%E3%83%BBLength%20of%20Tuple-7aad0c" alt="18・Length of Tuple"/></a> <a href="./questions/03312-easy-parameters/README.md" target="_blank"><img src="https://img.shields.io/badge/-3312%E3%83%BBParameters-7aad0c" alt="3312・Parameters"/></a> <a href="./questions/00010-medium-tuple-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BBTuple%20to%20Union-d9901a" alt="10・Tuple to Union"/></a> <a href="./questions/03188-medium-tuple-to-nested-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-3188%E3%83%BBTuple%20to%20Nested%20Object-d9901a" alt="3188・Tuple to Nested Object"/></a> <a href="./questions/03192-medium-reverse/README.md" target="_blank"><img src="https://img.shields.io/badge/-3192%E3%83%BBReverse-d9901a" alt="3192・Reverse"/></a> <a href="./questions/03326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/04471-medium-zip/README.md" target="_blank"><img src="https://img.shields.io/badge/-4471%E3%83%BBZip-d9901a" alt="4471・Zip"/></a> <a href="./questions/04484-medium-istuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-4484%E3%83%BBIsTuple-d9901a" alt="4484・IsTuple"/></a> <a href="./questions/04499-medium-chunk/README.md" target="_blank"><img src="https://img.shields.io/badge/-4499%E3%83%BBChunk-d9901a" alt="4499・Chunk"/></a> <a href="./questions/04518-medium-fill/README.md" target="_blank"><img src="https://img.shields.io/badge/-4518%E3%83%BBFill-d9901a" alt="4518・Fill"/></a> <a href="./questions/07544-medium-construct-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-7544%E3%83%BBConstruct%20Tuple-d9901a" alt="7544・Construct Tuple"/></a> <a href="./questions/00399-hard-tuple-filter/README.md" target="_blank"><img src="https://img.shields.io/badge/-399%E3%83%BBTuple%20Filter-de3d37" alt="399・Tuple Filter"/></a> <a href="./questions/00472-hard-tuple-to-enum-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-472%E3%83%BBTuple%20to%20Enum%20Object-de3d37" alt="472・Tuple to Enum Object"/></a> <a href="./questions/00730-hard-union-to-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-730%E3%83%BBUnion%20to%20Tuple-de3d37" alt="730・Union to Tuple"/></a> <a href="./questions/02822-hard-split/README.md" target="_blank"><img src="https://img.shields.io/badge/-2822%E3%83%BBSplit-de3d37" alt="2822・Split"/></a> <a href="./questions/07561-extreme-subtract/README.md" target="_blank"><img src="https://img.shields.io/badge/-7561%E3%83%BBSubtract-b11b8d" alt="7561・Subtract"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23union-999" alt="#union"/></td><td><a href="./questions/00004-easy-pick/README.md" target="_blank"><img src="https://img.shields.io/badge/-4%E3%83%BBPick-7aad0c" alt="4・Pick"/></a> <a href="./questions/00043-easy-exclude/README.md" target="_blank"><img src="https://img.shields.io/badge/-43%E3%83%BBExclude-7aad0c" alt="43・Exclude"/></a> <a href="./questions/00003-medium-omit/README.md" target="_blank"><img src="https://img.shields.io/badge/-3%E3%83%BBOmit-d9901a" alt="3・Omit"/></a> <a href="./questions/00010-medium-tuple-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BBTuple%20to%20Union-d9901a" alt="10・Tuple to Union"/></a> <a href="./questions/00062-medium-type-lookup/README.md" target="_blank"><img src="https://img.shields.io/badge/-62%E3%83%BBType%20Lookup-d9901a" alt="62・Type Lookup"/></a> <a href="./questions/00296-medium-permutation/README.md" target="_blank"><img src="https://img.shields.io/badge/-296%E3%83%BBPermutation-d9901a" alt="296・Permutation"/></a> <a href="./questions/00531-medium-string-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-531%E3%83%BBString%20to%20Union-d9901a" alt="531・String to Union"/></a> <a href="./questions/01042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a> <a href="./questions/01097-medium-isunion/README.md" target="_blank"><img src="https://img.shields.io/badge/-1097%E3%83%BBIsUnion-d9901a" alt="1097・IsUnion"/></a> <a href="./questions/03326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/04260-medium-nomiwase/README.md" target="_blank"><img src="https://img.shields.io/badge/-4260%E3%83%BBAllCombinations-d9901a" alt="4260・AllCombinations"/></a> <a href="./questions/05117-medium-without/README.md" target="_blank"><img src="https://img.shields.io/badge/-5117%E3%83%BBWithout-d9901a" alt="5117・Without"/></a> <a href="./questions/08987-medium-subsequence/README.md" target="_blank"><img src="https://img.shields.io/badge/-8987%E3%83%BBSubsequence-d9901a" alt="8987・Subsequence"/></a> <a href="./questions/00730-hard-union-to-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-730%E3%83%BBUnion%20to%20Tuple-de3d37" alt="730・Union to Tuple"/></a> <a href="./questions/01383-hard-camelize/README.md" target="_blank"><img src="https://img.shields.io/badge/-1383%E3%83%BBCamelize-de3d37" alt="1383・Camelize"/></a> <a href="./questions/05423-hard-intersection/README.md" target="_blank"><img src="https://img.shields.io/badge/-5423%E3%83%BBIntersection-de3d37" alt="5423・Intersection"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23utils-999" alt="#utils"/></td><td><a href="./questions/00268-easy-if/README.md" target="_blank"><img src="https://img.shields.io/badge/-268%E3%83%BBIf-7aad0c" alt="268・If"/></a> <a href="./questions/01042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a> <a href="./questions/05821-medium-maptypes/README.md" target="_blank"><img src="https://img.shields.io/badge/-5821%E3%83%BBMapTypes-d9901a" alt="5821・MapTypes"/></a> <a href="./questions/00055-hard-union-to-intersection/README.md" target="_blank"><img src="https://img.shields.io/badge/-55%E3%83%BBUnion%20to%20Intersection-de3d37" alt="55・Union to Intersection"/></a> <a href="./questions/00057-hard-get-required/README.md" target="_blank"><img src="https://img.shields.io/badge/-57%E3%83%BBGet%20Required-de3d37" alt="57・Get Required"/></a> <a href="./questions/00059-hard-get-optional/README.md" target="_blank"><img src="https://img.shields.io/badge/-59%E3%83%BBGet%20Optional-de3d37" alt="59・Get Optional"/></a> <a href="./questions/00089-hard-required-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-89%E3%83%BBRequired%20Keys-de3d37" alt="89・Required Keys"/></a> <a href="./questions/00090-hard-optional-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-90%E3%83%BBOptional%20Keys-de3d37" alt="90・Optional Keys"/></a> <a href="./questions/00223-hard-isany/README.md" target="_blank"><img src="https://img.shields.io/badge/-223%E3%83%BBIsAny-de3d37" alt="223・IsAny"/></a> <a href="./questions/00270-hard-typed-get/README.md" target="_blank"><img src="https://img.shields.io/badge/-270%E3%83%BBTyped%20Get-de3d37" alt="270・Typed Get"/></a> <a href="./questions/02828-hard-classpublickeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2828%E3%83%BBClassPublicKeys-de3d37" alt="2828・ClassPublicKeys"/></a> <a href="./questions/02857-hard-isrequiredkey/README.md" target="_blank"><img src="https://img.shields.io/badge/-2857%E3%83%BBIsRequiredKey-de3d37" alt="2857・IsRequiredKey"/></a> <a href="./questions/05181-hard-mutable-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-5181%E3%83%BBMutable%20Keys-de3d37" alt="5181・Mutable Keys"/></a> <a href="./questions/00005-extreme-readonly-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-5%E3%83%BBGet%20Readonly%20Keys-b11b8d" alt="5・Get Readonly Keys"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23vue-999" alt="#vue"/></td><td><a href="./questions/00006-hard-simple-vue/README.md" target="_blank"><img src="https://img.shields.io/badge/-6%E3%83%BBSimple%20Vue-de3d37" alt="6・Simple Vue"/></a> <a href="./questions/00213-hard-vue-basic-props/README.md" target="_blank"><img src="https://img.shields.io/badge/-213%E3%83%BBVue%20Basic%20Props-de3d37" alt="213・Vue Basic Props"/></a> <a href="./questions/01290-hard-pinia/README.md" target="_blank"><img src="https://img.shields.io/badge/-1290%E3%83%BBPinia-de3d37" alt="1290・Pinia"/></a> </td></tr><tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code></td><td></td></tr></tbody></table></details><br><details><summary>By Plain Text</summary><br><h3>warm-up (1)</h3><ul><li><a href="./questions/00013-warm-hello-world/README.md" target="_blank">13・Hello World</a> </li></ul><h3>easy (13)</h3><ul><li><a href="./questions/00004-easy-pick/README.md" target="_blank">4・Pick</a> </li><li><a href="./questions/00007-easy-readonly/README.md" target="_blank">7・Readonly</a> </li><li><a href="./questions/00011-easy-tuple-to-object/README.md" target="_blank">11・Tuple to Object</a> </li><li><a href="./questions/00014-easy-first/README.md" target="_blank">14・First of Array</a> </li><li><a href="./questions/00018-easy-tuple-length/README.md" target="_blank">18・Length of Tuple</a> </li><li><a href="./questions/00043-easy-exclude/README.md" target="_blank">43・Exclude</a> </li><li><a href="./questions/00189-easy-awaited/README.md" target="_blank">189・Awaited</a> </li><li><a href="./questions/00268-easy-if/README.md" target="_blank">268・If</a> </li><li><a href="./questions/00533-easy-concat/README.md" target="_blank">533・Concat</a> </li><li><a href="./questions/00898-easy-includes/README.md" target="_blank">898・Includes</a> </li><li><a href="./questions/03057-easy-push/README.md" target="_blank">3057・Push</a> </li><li><a href="./questions/03060-easy-unshift/README.md" target="_blank">3060・Unshift</a> </li><li><a href="./questions/03312-easy-parameters/README.md" target="_blank">3312・Parameters</a> </li></ul><h3>medium (75)</h3><ul><li><a href="./questions/00002-medium-return-type/README.md" target="_blank">2・Get Return Type</a> </li><li><a href="./questions/00003-medium-omit/README.md" target="_blank">3・Omit</a> </li><li><a href="./questions/00008-medium-readonly-2/README.md" target="_blank">8・Readonly 2</a> </li><li><a href="./questions/00009-medium-deep-readonly/README.md" target="_blank">9・Deep Readonly</a> </li><li><a href="./questions/00010-medium-tuple-to-union/README.md" target="_blank">10・Tuple to Union</a> </li><li><a href="./questions/00012-medium-chainable-options/README.md" target="_blank">12・Chainable Options</a> </li><li><a href="./questions/00015-medium-last/README.md" target="_blank">15・Last of Array</a> </li><li><a href="./questions/00016-medium-pop/README.md" target="_blank">16・Pop</a> </li><li><a href="./questions/00020-medium-promise-all/README.md" target="_blank">20・Promise.all</a> </li><li><a href="./questions/00062-medium-type-lookup/README.md" target="_blank">62・Type Lookup</a> </li><li><a href="./questions/00106-medium-trimleft/README.md" target="_blank">106・Trim Left</a> </li><li><a href="./questions/00108-medium-trim/README.md" target="_blank">108・Trim</a> </li><li><a href="./questions/00110-medium-capitalize/README.md" target="_blank">110・Capitalize</a> </li><li><a href="./questions/00116-medium-replace/README.md" target="_blank">116・Replace</a> </li><li><a href="./questions/00119-medium-replaceall/README.md" target="_blank">119・ReplaceAll</a> </li><li><a href="./questions/00191-medium-append-argument/README.md" target="_blank">191・Append Argument</a> </li><li><a href="./questions/00296-medium-permutation/README.md" target="_blank">296・Permutation</a> </li><li><a href="./questions/00298-medium-length-of-string/README.md" target="_blank">298・Length of String</a> </li><li><a href="./questions/00459-medium-flatten/README.md" target="_blank">459・Flatten</a> </li><li><a href="./questions/00527-medium-append-to-object/README.md" target="_blank">527・Append to object</a> </li><li><a href="./questions/00529-medium-absolute/README.md" target="_blank">529・Absolute</a> </li><li><a href="./questions/00531-medium-string-to-union/README.md" target="_blank">531・String to Union</a> </li><li><a href="./questions/00599-medium-merge/README.md" target="_blank">599・Merge</a> </li><li><a href="./questions/00612-medium-kebabcase/README.md" target="_blank">612・KebabCase</a> </li><li><a href="./questions/00645-medium-diff/README.md" target="_blank">645・Diff</a> </li><li><a href="./questions/00949-medium-anyof/README.md" target="_blank">949・AnyOf</a> </li><li><a href="./questions/01042-medium-isnever/README.md" target="_blank">1042・IsNever</a> </li><li><a href="./questions/01097-medium-isunion/README.md" target="_blank">1097・IsUnion</a> </li><li><a href="./questions/01130-medium-replacekeys/README.md" target="_blank">1130・ReplaceKeys</a> </li><li><a href="./questions/01367-medium-remove-index-signature/README.md" target="_blank">1367・Remove Index Signature</a> </li><li><a href="./questions/01978-medium-percentage-parser/README.md" target="_blank">1978・Percentage Parser</a> </li><li><a href="./questions/02070-medium-drop-char/README.md" target="_blank">2070・Drop Char</a> </li><li><a href="./questions/02257-medium-minusone/README.md" target="_blank">2257・MinusOne</a> </li><li><a href="./questions/02595-medium-pickbytype/README.md" target="_blank">2595・PickByType</a> </li><li><a href="./questions/02688-medium-startswith/README.md" target="_blank">2688・StartsWith</a> </li><li><a href="./questions/02693-medium-endswith/README.md" target="_blank">2693・EndsWith</a> </li><li><a href="./questions/02757-medium-partialbykeys/README.md" target="_blank">2757・PartialByKeys</a> </li><li><a href="./questions/02759-medium-requiredbykeys/README.md" target="_blank">2759・RequiredByKeys</a> </li><li><a href="./questions/02793-medium-mutable/README.md" target="_blank">2793・Mutable</a> </li><li><a href="./questions/02852-medium-omitbytype/README.md" target="_blank">2852・OmitByType</a> </li><li><a href="./questions/02946-medium-objectentries/README.md" target="_blank">2946・ObjectEntries</a> </li><li><a href="./questions/03062-medium-shift/README.md" target="_blank">3062・Shift</a> </li><li><a href="./questions/03188-medium-tuple-to-nested-object/README.md" target="_blank">3188・Tuple to Nested Object</a> </li><li><a href="./questions/03192-medium-reverse/README.md" target="_blank">3192・Reverse</a> </li><li><a href="./questions/03196-medium-flip-arguments/README.md" target="_blank">3196・Flip Arguments</a> </li><li><a href="./questions/03243-medium-flattendepth/README.md" target="_blank">3243・FlattenDepth</a> </li><li><a href="./questions/03326-medium-bem-style-string/README.md" target="_blank">3326・BEM style string</a> </li><li><a href="./questions/03376-medium-inordertraversal/README.md" target="_blank">3376・InorderTraversal</a> </li><li><a href="./questions/04179-medium-flip/README.md" target="_blank">4179・Flip</a> </li><li><a href="./questions/04182-medium-fibonacci-sequence/README.md" target="_blank">4182・Fibonacci Sequence</a> </li><li><a href="./questions/04260-medium-nomiwase/README.md" target="_blank">4260・AllCombinations</a> </li><li><a href="./questions/04425-medium-greater-than/README.md" target="_blank">4425・Greater Than</a> </li><li><a href="./questions/04471-medium-zip/README.md" target="_blank">4471・Zip</a> </li><li><a href="./questions/04484-medium-istuple/README.md" target="_blank">4484・IsTuple</a> </li><li><a href="./questions/04499-medium-chunk/README.md" target="_blank">4499・Chunk</a> </li><li><a href="./questions/04518-medium-fill/README.md" target="_blank">4518・Fill</a> </li><li><a href="./questions/04803-medium-trim-right/README.md" target="_blank">4803・Trim Right</a> </li><li><a href="./questions/05117-medium-without/README.md" target="_blank">5117・Without</a> </li><li><a href="./questions/05140-medium-trunc/README.md" target="_blank">5140・Trunc</a> </li><li><a href="./questions/05153-medium-indexof/README.md" target="_blank">5153・IndexOf</a> </li><li><a href="./questions/05310-medium-join/README.md" target="_blank">5310・Join</a> </li><li><a href="./questions/05317-medium-lastindexof/README.md" target="_blank">5317・LastIndexOf</a> </li><li><a href="./questions/05360-medium-unique/README.md" target="_blank">5360・Unique</a> </li><li><a href="./questions/05821-medium-maptypes/README.md" target="_blank">5821・MapTypes</a> </li><li><a href="./questions/07544-medium-construct-tuple/README.md" target="_blank">7544・Construct Tuple</a> </li><li><a href="./questions/08640-medium-number-range/README.md" target="_blank">8640・Number Range</a> </li><li><a href="./questions/08767-medium-combination/README.md" target="_blank">8767・Combination</a> </li><li><a href="./questions/08987-medium-subsequence/README.md" target="_blank">8987・Subsequence</a> </li><li><a href="./questions/09286-medium-firstuniquecharindex/README.md" target="_blank">9286・FirstUniqueCharIndex</a> </li><li><a href="./questions/09896-medium-get-middle-element/README.md" target="_blank">9896・GetMiddleElement</a> </li><li><a href="./questions/10969-medium-integer/README.md" target="_blank">10969・Integer</a> </li><li><a href="./questions/16259-medium-to-primitive/README.md" target="_blank">16259・ToPrimitive</a> </li><li><a href="./questions/17973-medium-deepmutable/README.md" target="_blank">17973・DeepMutable</a> </li><li><a href="./questions/18142-medium-all/README.md" target="_blank">18142・All</a> </li><li><a href="./questions/18220-medium-filter/README.md" target="_blank">18220・Filter</a> </li></ul><h3>hard (43)</h3><ul><li><a href="./questions/00006-hard-simple-vue/README.md" target="_blank">6・Simple Vue</a> </li><li><a href="./questions/00017-hard-currying-1/README.md" target="_blank">17・Currying 1</a> </li><li><a href="./questions/00055-hard-union-to-intersection/README.md" target="_blank">55・Union to Intersection</a> </li><li><a href="./questions/00057-hard-get-required/README.md" target="_blank">57・Get Required</a> </li><li><a href="./questions/00059-hard-get-optional/README.md" target="_blank">59・Get Optional</a> </li><li><a href="./questions/00089-hard-required-keys/README.md" target="_blank">89・Required Keys</a> </li><li><a href="./questions/00090-hard-optional-keys/README.md" target="_blank">90・Optional Keys</a> </li><li><a href="./questions/00112-hard-capitalizewords/README.md" target="_blank">112・Capitalize Words</a> </li><li><a href="./questions/00114-hard-camelcase/README.md" target="_blank">114・CamelCase</a> </li><li><a href="./questions/00147-hard-c-printf-parser/README.md" target="_blank">147・C-printf Parser</a> </li><li><a href="./questions/00213-hard-vue-basic-props/README.md" target="_blank">213・Vue Basic Props</a> </li><li><a href="./questions/00223-hard-isany/README.md" target="_blank">223・IsAny</a> </li><li><a href="./questions/00270-hard-typed-get/README.md" target="_blank">270・Typed Get</a> </li><li><a href="./questions/00300-hard-string-to-number/README.md" target="_blank">300・String to Number</a> </li><li><a href="./questions/00399-hard-tuple-filter/README.md" target="_blank">399・Tuple Filter</a> </li><li><a href="./questions/00472-hard-tuple-to-enum-object/README.md" target="_blank">472・Tuple to Enum Object</a> </li><li><a href="./questions/00545-hard-printf/README.md" target="_blank">545・printf</a> </li><li><a href="./questions/00553-hard-deep-object-to-unique/README.md" target="_blank">553・Deep object to unique</a> </li><li><a href="./questions/00651-hard-length-of-string-2/README.md" target="_blank">651・Length of String 2</a> </li><li><a href="./questions/00730-hard-union-to-tuple/README.md" target="_blank">730・Union to Tuple</a> </li><li><a href="./questions/00847-hard-string-join/README.md" target="_blank">847・String Join</a> </li><li><a href="./questions/00956-hard-deeppick/README.md" target="_blank">956・DeepPick</a> </li><li><a href="./questions/01290-hard-pinia/README.md" target="_blank">1290・Pinia</a> </li><li><a href="./questions/01383-hard-camelize/README.md" target="_blank">1383・Camelize</a> </li><li><a href="./questions/02059-hard-drop-string/README.md" target="_blank">2059・Drop String</a> </li><li><a href="./questions/02822-hard-split/README.md" target="_blank">2822・Split</a> </li><li><a href="./questions/02828-hard-classpublickeys/README.md" target="_blank">2828・ClassPublicKeys</a> </li><li><a href="./questions/02857-hard-isrequiredkey/README.md" target="_blank">2857・IsRequiredKey</a> </li><li><a href="./questions/02949-hard-objectfromentries/README.md" target="_blank">2949・ObjectFromEntries</a> </li><li><a href="./questions/04037-hard-ispalindrome/README.md" target="_blank">4037・IsPalindrome</a> </li><li><a href="./questions/05181-hard-mutable-keys/README.md" target="_blank">5181・Mutable Keys</a> </li><li><a href="./questions/05423-hard-intersection/README.md" target="_blank">5423・Intersection</a> </li><li><a href="./questions/06141-hard-binary-to-decimal/README.md" target="_blank">6141・Binary to Decimal</a> </li><li><a href="./questions/07258-hard-object-key-paths/README.md" target="_blank">7258・Object Key Paths</a> </li><li><a href="./questions/08804-hard-two-sum/README.md" target="_blank">8804・Two Sum</a> </li><li><a href="./questions/09155-hard-validdate/README.md" target="_blank">9155・ValidDate</a> </li><li><a href="./questions/09160-hard-assign/README.md" target="_blank">9160・Assign</a> </li><li><a href="./questions/09384-hard-maximum/README.md" target="_blank">9384・Maximum</a> </li><li><a href="./questions/09775-hard-capitalize-nest-object-keys/README.md" target="_blank">9775・Capitalize Nest Object Keys</a> </li><li><a href="./questions/13580-hard-replace-union/README.md" target="_blank">13580・Replace Union</a> </li><li><a href="./questions/14080-hard-fizzbuzz/README.md" target="_blank">14080・FizzBuzz</a> </li><li><a href="./questions/14188-hard-run-length-encoding/README.md" target="_blank">14188・Run-length encoding</a> </li><li><a href="./questions/15260-hard-tree-path-array/README.md" target="_blank">15260・Tree path array</a> </li></ul><h3>extreme (14)</h3><ul><li><a href="./questions/00005-extreme-readonly-keys/README.md" target="_blank">5・Get Readonly Keys</a> </li><li><a href="./questions/00151-extreme-query-string-parser/README.md" target="_blank">151・Query String Parser</a> </li><li><a href="./questions/00216-extreme-slice/README.md" target="_blank">216・Slice</a> </li><li><a href="./questions/00274-extreme-integers-comparator/README.md" target="_blank">274・Integers Comparator</a> </li><li><a href="./questions/00462-extreme-currying-2/README.md" target="_blank">462・Currying 2</a> </li><li><a href="./questions/00476-extreme-sum/README.md" target="_blank">476・Sum</a> </li><li><a href="./questions/00517-extreme-multiply/README.md" target="_blank">517・Multiply</a> </li><li><a href="./questions/00697-extreme-tag/README.md" target="_blank">697・Tag</a> </li><li><a href="./questions/00734-extreme-inclusive-range/README.md" target="_blank">734・Inclusive Range</a> </li><li><a href="./questions/00741-extreme-sort/README.md" target="_blank">741・Sort</a> </li><li><a href="./questions/00869-extreme-distributeunions/README.md" target="_blank">869・DistributeUnions</a> </li><li><a href="./questions/00925-extreme-assert-array-index/README.md" target="_blank">925・Assert Array Index</a> </li><li><a href="./questions/06228-extreme-json-parser/README.md" target="_blank">6228・JSON Parser</a> </li><li><a href="./questions/07561-extreme-subtract/README.md" target="_blank">7561・Subtract</a> </li></ul></details><br>
<!--challenges-end-->
> ✨ [Upcoming challenges](https://github.com/type-challenges/type-challenges/issues?q=is%3Aissue+is%3Aopen+label%3Anew-challenge)
> 🔥 Start the challenge in [TypeScript Playground](https://www.typescriptlang.org/play?install-plugin=%40type-challenges%2Fplayground-plugin)
> ⚡️ Start the challenge in [VS Code](https://marketplace.visualstudio.com/items?itemName=YRM.type-challenges)
## Recommended Readings
### Official
- [The TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/intro.html)
- [Unions and Intersection Types](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#union-types)
- [Literal Types](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types)
- [Utility Types](https://www.typescriptlang.org/docs/handbook/utility-types.html)
- [Advanced Types](https://www.typescriptlang.org/docs/handbook/2/types-from-types.html)
- [The New Handbook](https://github.com/microsoft/TypeScript-Website/tree/v2/packages/documentation/copy/en/handbook-v2)
### Articles
- [Learn Advanced TypeScript Types](https://medium.com/free-code-camp/typescript-curry-ramda-types-f747e99744ab)
- [The Art of Type Programming](https://mistlog.medium.com/the-art-of-type-programming-cfd933bdfff7)
- [Type Query: jQuery Style Type Manipulation](https://mistlog.medium.com/type-query-jquery-style-type-manipulation-497ce26d93f)
### Talks
- [Type Level Programming in Typescript](https://www.youtube.com/watch?reload=9&v=vGVvJuazs84)
### Projects / Solutions
- [Type Gymnastics](https://github.com/g-plane/type-gymnastics)
- [Type Challenges Solutions](https://github.com/ghaiklor/type-challenges-solutions)
- [TypeType Examples](https://github.com/mistlog/typetype-examples)
### Books
- [Effective TypeScript](https://effectivetypescript.com/)
- [Learning TypeScript](https://www.learningtypescript.com/)
> TODO
## How to Contribute
There are several ways you can contribute to this project
- Share your answers / solutions
- Propose new challenges
- Add more test cases to the existing challenges
- Provide learning resources or ideas of how to solve challenges
- Share the problems you have faced in real-world projects, regardless you having the solution or not - the community would help you as well
- Help with others by discussion in issues
- Contribute the infra of this project [TODOs.md](./TODOs.md)
Just [open an issue](https://github.com/type-challenges/type-challenges/issues/new/choose) and choose the corresponding template. Thanks!
## Thanks
This project was born from solving real-world types problem with [@hardfist](https://github.com/hardfist) and [@MeCKodo](https://github.com/MeCKodo). And great thanks to [@sinoon](https://github.com/sinoon) who contributed a lot while giving early feedback on this project.
### Inspired by
- [piotrwitek/utility-types](https://github.com/piotrwitek/utility-types)
- [psmyrdek/typescript-challenges](https://github.com/psmyrdek/typescript-challenges)
- [andnp/SimplyTyped](https://github.com/andnp/SimplyTyped)
### [Contributors](https://github.com/type-challenges/type-challenges/graphs/contributors)
![Contributors](https://contrib.rocks/image?repo=type-challenges/type-challenges)
## License
MIT
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