color cycle text for the commandline

gistfile1.txt

function changeColor(str) {
    const arr = str.split("");
    let a = arr.length - 1,
        b = 8;

    do {
        arr[a] = `\u001b[3${b}m${arr[a]}`;
        a = a - 1;
        b = b - 1;
        if (b < 1) {
            b = 8;
        }
    } while (a > 0);
    return arr.join("") + "\u001b[0m";
}