9 lines
263 B
Markdown
9 lines
263 B
Markdown
### Array intersection
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Create a `Set` from `b`, then use `Array.filter()` on `a` to only keep values contained in `b`.
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```js
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const intersection = (a, b) => { const s = new Set(b); return a.filter(x => s.has(x)); }
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// intersection([1,2,3], [4,3,2]) -> [2,3]
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```
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