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x/ramda/xprod.js

:ram: Practical functional Javascript
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import _curry2 from './internal/_curry2';

/** * Creates a new list out of the two supplied by creating each possible pair * from the lists. * * @func * @memberOf R * @since v0.1.0 * @category List * @sig [a] -> [b] -> [[a,b]] * @param {Array} as The first list. * @param {Array} bs The second list. * @return {Array} The list made by combining each possible pair from * `as` and `bs` into pairs (`[a, b]`). * @example * * R.xprod([1, 2], ['a', 'b']); //=> [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']] * @symb R.xprod([a, b], [c, d]) = [[a, c], [a, d], [b, c], [b, d]] */var xprod = _curry2(function xprod(a, b) { // = xprodWith(prepend); (takes about 3 times as long...) var idx = 0; var ilen = a.length; var j; var jlen = b.length; var result = []; while (idx < ilen) { j = 0; while (j < jlen) { result[result.length] = [a[idx], b[j]]; j += 1; } idx += 1; } return result;});export default xprod;