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xProd javascript Code Snippet in 2024

arraymathintermediate

Last Updated: 12 April 2024

Creates a new array out of the two supplied by creating each possible pair from the arrays.

  • Use Array.prototype.reduce(), Array.prototype.map() and Array.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']]

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