the powering ladder

power.js

function myPower(x, n) {
    var y = 1;
    while (1) {
        t = n % 2;
        n = Math.floor(n / 2);
        if (t == 1) {
            y = y * x;
        }
        if (n == 0) {
            break;
        }
        x = x * x;
    }
    return y;
}