23 lines
625 B
Markdown
23 lines
625 B
Markdown
---
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title: symmetricDifference
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tags: array,math,intermediate
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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 `new 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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