Javascript number to hexadecimal string function.

numToHex.js

/**
 * 'Fast Remainder' method for number to hex.
 * @see http://www.wikihow.com/Convert-from-Decimal-to-Hexadecimal (fast remainder method (method 2)).
 */
    const hexMap = [
        [0, 0], [1, 1], [2, 2], [3, 3], [4, 4], [5, 5],
        [6, 6], [7, 7], [8, 8], [9, 9], [10, 'A'], [11, 'B'],
        [12, 'C'], [13, 'D'], [14, 'E'], [15, 'F']
    ];

    function numToHex (d) {
        var q,
            r,
            a = [],
            out = '0x';
        do {
            q = parseInt(d / 16, 10);
            r = d - (q * 16);
            a.push(hexMap[r][1]);
            d = q;
        }
        while  (q > 0);
        for (var i = a.length - 1; i >= 0; i -= 1) {
            out += a[i];
        }
        return out;
    }