您将如何在JavaScript中实现多个数组的笛卡尔积？
举个例子，
cartesian([1, 2], [10, 20], [100, 200, 300])
应该回来
[ [1, 10, 100], [1, 10, 200], [1, 10, 300], [2, 10, 100], [2, 10, 200] ... ]
这是使用和提供的解决问题的功能解决方案（没有任何 可变变量 ！），该提供者为：reduce``flatten``underscore.js
reduce``flatten``underscore.js
function cartesianProductOf() { return _.reduce(arguments, function(a, b) { return _.flatten(_.map(a, function(x) { return _.map(b, function(y) { return x.concat([y]); }); }), true); }, [ [] ]); } // [[1,3,"a"],[1,3,"b"],[1,4,"a"],[1,4,"b"],[2,3,"a"],[2,3,"b"],[2,4,"a"],[2,4,"b"]] console.log(cartesianProductOf([1, 2], [3, 4], ['a'])); <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore.js"></script>
