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.`.
21 lines
555 B
Markdown
21 lines
555 B
Markdown
### symmetricDifferenceWith
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Returns the symmetric difference between two arrays, using a provided function as a comparator.
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Use `Array.prototype.filter()` and `Array.prototype.findIndex()` to find the appropriate values.
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```js
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const symmetricDifferenceWith = (arr, val, comp) => [
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...arr.filter(a => val.findIndex(b => comp(a, b)) === -1),
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...val.filter(a => arr.findIndex(b => comp(a, b)) === -1)
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];
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```
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```js
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symmetricDifferenceWith(
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[1, 1.2, 1.5, 3, 0],
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[1.9, 3, 0, 3.9],
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(a, b) => Math.round(a) === Math.round(b)
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); // [1, 1.2, 3.9]
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```
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