Arab to Roman

let wArab2Roman = t => {
    const r = {
        1: "I",
        10: "X",
        5: "V",
        50: "L",
        100: "C"
    };
    let a = t => {
            let a = "",
                e = t.toString().split("");
            for (let l in e) t < 4 ? a += r[1].repeat(t) : 4 == t ? a += r[1] + r[5] : t > 4 && t < 9 ? a += r[5] + r[1].repeat(t - 5) : 9 == t ? a += r[1] + r[10] : a = r[10];
            return a
        },
        e = a(t);
    return t > 10 && t < 40 && (e = r[10].repeat(t.toString()[0]) + a(t.toString()[1])), e
}

let sayilar = "";
for (let t = 1; t < 40; t++)
    sayilar += `wArab2Roman(${t}): ${wArab2Roman(t)}\n`;
console.log("Sayilar:\n" + sayilar);