17 lines
699 B
Markdown
17 lines
699 B
Markdown
### Array zip
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Use `Math.max.apply()` to get the longest array in the arguments.
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Creates an array with that length as return value and use `Array.from()` with a map-function to create an array of grouped elements.
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If lengths of the argument-arrays vary, `undefined` is used where no value could be found.
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```js
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const zip = (...arrays) => {
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const maxLength = Math.max(...arrays.map(x => x.length));
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return Array.from({length: maxLength}).map((_, i) => {
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return Array.from({length: arrays.length}, (_, k) => arrays[k][i]);
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})
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}
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//zip(['a', 'b'], [1, 2], [true, false]); -> [['a', 1, true], ['b', 2, false]]
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//zip(['a'], [1, 2], [true, false]); -> [['a', 1, true], [undefined, 2, false]]
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```
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