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.`.
17 lines
599 B
Markdown
17 lines
599 B
Markdown
### uniqueSymmetricDifference
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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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