From 2e708a95cc715fe51a00c60577b56860490b355c Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Wed, 5 Aug 2020 22:02:07 +0800
Subject: [PATCH] feat(question): add #59 - Get Optional (#60)

Co-authored-by: Zheeeng <1303154+zheeeng@users.noreply.github.com>
---
 questions/59-hard-get-optional/README.md     | 7 +++++++
 questions/59-hard-get-optional/info.yml      | 7 +++++++
 questions/59-hard-get-optional/template.ts   | 1 +
 questions/59-hard-get-optional/test-cases.ts | 6 ++++++
 4 files changed, 21 insertions(+)
 create mode 100644 questions/59-hard-get-optional/README.md
 create mode 100644 questions/59-hard-get-optional/info.yml
 create mode 100644 questions/59-hard-get-optional/template.ts
 create mode 100644 questions/59-hard-get-optional/test-cases.ts

diff --git a/questions/59-hard-get-optional/README.md b/questions/59-hard-get-optional/README.md
new file mode 100644
index 00000000..cf35b64c
--- /dev/null
+++ b/questions/59-hard-get-optional/README.md
@@ -0,0 +1,7 @@
+Implement the advanced util type `GetOptional<T>`, which remains all the optional fields
+
+For example
+
+```ts
+type I = GetOptional<{ foo: number, bar?: string }> // expected to be { bar?: string }
+```
diff --git a/questions/59-hard-get-optional/info.yml b/questions/59-hard-get-optional/info.yml
new file mode 100644
index 00000000..49152359
--- /dev/null
+++ b/questions/59-hard-get-optional/info.yml
@@ -0,0 +1,7 @@
+difficulty: hard
+title: Get Optional
+tags: 'utils, infer'
+author:
+  github: zheeeng
+  name: Zheeeng
+
diff --git a/questions/59-hard-get-optional/template.ts b/questions/59-hard-get-optional/template.ts
new file mode 100644
index 00000000..f5699f99
--- /dev/null
+++ b/questions/59-hard-get-optional/template.ts
@@ -0,0 +1 @@
+type GetOptional<T> = any
diff --git a/questions/59-hard-get-optional/test-cases.ts b/questions/59-hard-get-optional/test-cases.ts
new file mode 100644
index 00000000..b1ecd1d9
--- /dev/null
+++ b/questions/59-hard-get-optional/test-cases.ts
@@ -0,0 +1,6 @@
+import { Equal, Expect, ExpectFalse, NotEqual } from '@type-challenges/utils'
+
+type cases = [
+    Expect<Equal<GetOptional<{ foo: number, bar?: string }>, { bar?: string }>>,
+    Expect<Equal<GetOptional<{ foo: undefined, bar?: undefined }>, { bar?: undefined }>>,
+]