Tiny JavaScript brutforce

brutforce.js

var n, al = ['A', 'B', 'C', 'D'], r = ['', '', ''], linesCount = 100;

for (var i = 0; i < linesCount; i++) {
    n = i;
    r = ['', '', '',];
    for (var j = r.length - 1; j >= 0; j--) {
        r[j] = al[n % al.length];
        n = Math.floor(n / al.length);
    }
    console.log(r);
}