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52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
# Set operations
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Logical set operations for any iterable.
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## difference(*iterable*, ...*others*) {#difference}
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[Source](https://github.com/d3/d3-array/blob/main/src/difference.js) · Returns a new [InternSet](./intern.md#InternSet) containing every value in *iterable* that is not in any of the *others* iterables.
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```js
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d3.difference([0, 1, 2, 0], [1]) // Set {0, 2}
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```
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## union(...*iterables*) {#union}
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[Source](https://github.com/d3/d3-array/blob/main/src/union.js) · Returns a new [InternSet](./intern.md#InternSet) containing every (distinct) value that appears in any of the given *iterables*. The order of values in the returned set is based on their first occurrence in the given *iterables*.
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```js
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d3.union([0, 2, 1, 0], [1, 3]) // Set {0, 2, 1, 3}
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```
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## intersection(...*iterables*) {#intersection}
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[Source](https://github.com/d3/d3-array/blob/main/src/intersection.js) · Returns a new [InternSet](./intern.md#InternSet) containing every (distinct) value that appears in all of the given *iterables*. The order of values in the returned set is based on their first occurrence in the given *iterables*.
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```js
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d3.intersection([0, 2, 1, 0], [1, 3]) // Set {1}
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```
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## superset(*a*, *b*) {#superset}
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[Source](https://github.com/d3/d3-array/blob/main/src/superset.js) · Returns true if *a* is a superset of *b*: if every value in the given iterable *b* is also in the given iterable *a*.
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```js
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d3.superset([0, 2, 1, 3, 0], [1, 3]) // true
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```
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## subset(*a*, *b*) {#subset}
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[Source](https://github.com/d3/d3-array/blob/main/src/subset.js) · Returns true if *a* is a subset of *b*: if every value in the given iterable *a* is also in the given iterable *b*.
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```js
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d3.subset([1, 3], [0, 2, 1, 3, 0]) // true
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```
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## disjoint(*a*, *b*) {#disjoint}
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[Source](https://github.com/d3/d3-array/blob/main/src/disjoint.js) · Returns true if *a* and *b* are disjoint: if *a* and *b* contain no shared value.
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```js
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d3.disjoint([1, 3], [2, 4]) // true
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```
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