<pre class="shiki github-dark shaku"><code>const symbols = [ ['I', 'V', 'X'], ['X', 'L', 'C'],//multiple of 10 ['C', 'D', 'M'],//multiple of 100 ['M'] //multiple of 1000];/** * @param {number} integer * @returns {string} str - roman numeral string */function integerToRoman(num) { const numStr = String(num).split('').reverse(); return numStr.map((digit, i) =&gt; { const n = Number(digit); const [one, five, ten] = symbols[i]; if (n === 0) return ''; if (n &lt; 4) { return one.repeat(n); } else if (n === 4) { return one + five; } else if (n &lt; 9) { return five + one.repeat(n - 5); } else { return one + ten; } }).reverse().join('');}</code></pre>

Translate every digit, then combine

> This is reverse of 133. roman numerals to integer Roman numerals are represented by combinations of following seven symbols, each with a fixed integ…