27 lines
715 B
Markdown
27 lines
715 B
Markdown
---
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title: Array symmetric difference
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type: snippet
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language: javascript
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tags: [array,math]
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cover: rocky-mountains-2
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dateModified: 2020-10-22T20:24:30+03:00
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---
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Returns the symmetric difference between two arrays, without filtering out duplicate values.
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- Create a `Set` from each array to get the unique values of each one.
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- Use `Array.prototype.filter()` on each of them to only keep values not contained in the other.
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```js
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const symmetricDifference = (a, b) => {
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const sA = new Set(a),
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sB = new Set(b);
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return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];
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};
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```
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```js
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symmetricDifference([1, 2, 3], [1, 2, 4]); // [3, 4]
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symmetricDifference([1, 2, 2], [1, 3, 1]); // [2, 2, 3]
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```
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