Lodash mixin to produce the product of two arrays.

gistfile1.js

_.mixin({
    'combine': function (xArray, yArray, func) {
        return xArray.map(function (x) {
            return yArray.map(function (y) {
                return func(x, y);
            });
        });
    }
});


//usage
var verbs = ['herp', 'derp', 'glerp'];
var endings = [ 'ing', 'ed' ];
var append = function (start, end) { return start + end; });

_(verbs).combine(endings, append).tap(console.log);
// [ [ 'herping', 'herped' ], ['derping', 'derped'], ['glerping', 'glerped'] ]