20 lines
642 B
Markdown
20 lines
642 B
Markdown
---
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title: uniqueSymmetricDifference
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tags: array,math,intermediate
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---
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Returns the unique symmetric difference between two arrays, not containing duplicate values from either array.
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- Use `Array.prototype.filter()` and `Array.prototype.includes()` on each array to remove values contained in the other, then create a `Set` from the results, removing duplicate values.
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```js
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const uniqueSymmetricDifference = (a, b) => [
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...new Set([...a.filter(v => !b.includes(v)), ...b.filter(v => !a.includes(v))])
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];
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```
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```js
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uniqueSymmetricDifference([1, 2, 3], [1, 2, 4]); // [3, 4]
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uniqueSymmetricDifference([1, 2, 2], [1, 3, 1]); // [2, 3]
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```
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