24 lines
606 B
Markdown
24 lines
606 B
Markdown
---
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title: intersectionWith
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tags: array,intermediate
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firstSeen: 2018-01-24T12:53:18+02:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Returns the elements that exist in both arrays, using a provided comparator function.
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- Use `Array.prototype.filter()` and `Array.prototype.findIndex()` in combination with the provided comparator to determine intersecting values.
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```js
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const intersectionWith = (a, b, comp) =>
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a.filter(x => b.findIndex(y => comp(x, y)) !== -1);
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```
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```js
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intersectionWith(
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[1, 1.2, 1.5, 3, 0],
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[1.9, 3, 0, 3.9],
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(a, b) => Math.round(a) === Math.round(b)
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); // [1.5, 3, 0]
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```
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