Joins in Javascript

Question

I have 2 lists of objects:

people = 
[{id: 1, name: \"Tom\", carid: 1},
 {id: 2, name: \"Bob\", carid: 1},
 {id: 3, name: \"Sir Benjamin Rogan-Josh IV\", car         


        

Answer 1

It is not hard to implement using underscore.js

function leftJoin(left, right, left_id, right_id) {
    var result = [];
    _.each(left, function (litem) {
        var f = _.filter(right, function (ritem) {
            return ritem[right_id] == litem[left_id];
        });
        if (f.length == 0) {
            f = [{}];
        }
        _.each(f, function (i) {
            var newObj = {};
            _.each(litem, function (v, k) {
                newObj[k + "1"] = v;
            });
            _.each(i, function (v, k) {
                newObj[k + "2"] = v;
            });
            result.push(newObj);
        });
    });
    return result;
}

leftJoin(people, cars, "carid", "id");