Cross product of arrays
JavaScript, Math, Array · Oct 22, 2020
Creates a new array out of the two supplied by creating each possible pair from the arrays.
- Use
Array.prototype.reduce(),Array.prototype.map()andArray.prototype.concat()to produce every possible pair from the elements of the two arrays.
const xProd = (a, b) =>
a.reduce((acc, x) => acc.concat(b.map(y => [x, y])), []);xProd([1, 2], ['a', 'b']); // [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
