17 lines
535 B
Markdown
17 lines
535 B
Markdown
---
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title: intersectionWith
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tags: array,function,intermediate
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---
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Returns a list of 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) => a.filter(x => b.findIndex(y => comp(x, y)) !== -1);
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```
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```js
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intersectionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b)); // [1.5, 3, 0]
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```
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