27 lines
680 B
Markdown
27 lines
680 B
Markdown
---
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title: Array symmetric difference
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tags: array
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cover: digital-nomad
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firstSeen: 2018-01-24T11:59:02+02:00
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lastUpdated: 2020-10-18T14:58:09+03:00
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---
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Returns the symmetric difference between two arrays, using a provided function as a comparator.
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- Use `Array.prototype.filter()` and `Array.prototype.findIndex()` to find the appropriate values.
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```js
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const symmetricDifferenceWith = (arr, val, comp) => [
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...arr.filter(a => val.findIndex(b => comp(a, b)) === -1),
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...val.filter(a => arr.findIndex(b => comp(a, b)) === -1)
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];
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```
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```js
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symmetricDifferenceWith(
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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, 1.2, 3.9]
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```
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