8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
19 lines
542 B
Markdown
19 lines
542 B
Markdown
### symmetricDifference
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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, then 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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