function pad(num, size) {
    num = num.toString();
    while (num.length < size) num = "0" + num;
    return num;
}

const msg:string = "Einen Farbverlauf (schwarz-rot-gold) programmieren:";
let r = 0;
let g = 0;
let b = 0;
let s = "$";
let half = msg.length / 2;
for (let i = 0; i < msg.length; i++) {
    if (i < half) {
        r = Math.round(255 * i / half);
    } else {
        g = Math.round(255 * (i - half) / half);
    }
    s += `\\color{#${pad(r.toString(16), 2)}${pad(g.toString(16), 2)}${pad(b.toString(16), 2)}}`;

    let c = msg.charAt(i);
    if (c == ' ')
        s += `{\\${c}}`;
    else
        s += `{${c}}`;
}
s += "$"
console.log(s);