Trying to get all possible combinations using javascript

Question

i'm currently stuck on this problem,

suppose there is an array arr4(length is not fixed). I need to find all combinations of its element.

expected output is:

4-16D-5d 
4-16D-5e
4A-16D-5d
4A-16D-5e
4B-16D-5d
4B-16D-5e

4-15D-5d
4-15D-5e
4A-15D-5d
4A-15D-5e
4B-15D-5d
4B-15D-5e

What i tried is:

arr4=[['4','4A','4B'],['16D','15D'],['5d','5e']]; //may contains more elements
alert("arr4 "+arr4);
for(var k=0;k<arr4.length;k++){
    alert("k "+k);
    arr_v=arr4[k]
    alert("arrv"+arr_v);
    alert ("arrv lengt"+arr_v.length);
    for(var z=0;z<arr_v.length;z++){
        m=1;
        while(m<arr4.length){
            var test=arr4[m];
            for(var n=0;n<test.length;n++)
                alert(arr_v[z]+"<TEST>"+test[n]);
        }
        m++;
    }
}   

I kind of found a solution:

function product() {
    return Array.prototype.reduce.call(arguments, function(as, bs) {
        return [a.concat(b) for each (a in as) for each (b in bs)]
    }, [[]]);
}

BUT

arr4=[['4','4A','4B'],['16D','15D'],['5d','5e']];
alert(product(['4','4A','4B'],['16D','15D'],['5d','5e']);

The above works but the following don't work:

arr4=[['4','4A','4B'],['16D','15D'],['5d','5e']];
alert(product(arr4);

Anyone please suggest a solution

edit:solution here

Answer 1

You can compute the cartesian product of each sub-array. See this question and its answer

I tried it out, and since it goes off the length of each array, it should work no matter how many elements are in each list and return you a list of each product.