16 lines
500 B
Markdown
16 lines
500 B
Markdown
---
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title: xProd
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tags: array,math,intermediate
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---
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Creates a new array out of the two supplied by creating each possible pair from the arrays.
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Use `Array.prototype.reduce()`, `Array.prototype.map()` and `Array.prototype.concat()` to produce every possible pair from the elements of the two arrays and save them in an array.
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```js
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const xProd = (a, b) => a.reduce((acc, x) => acc.concat(b.map(y => [x, y])), []);
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```
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```js
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xProd([1, 2], ['a', 'b']); // [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
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``` |