<pre class="shiki github-dark shaku"><code>/** * @param {number} num * @return {string} */function addComma(num) { // your code here const sign = num.toString()[0] === "-" ? "-" : ""; const integer = Boolean(sign) ? num.toString().slice(1) : num.toString(); let [ realNum, decimal = "" ] = integer.split("."); let result = ""; while(realNum) { if(realNum.length &gt; 3){ result = "," + realNum.slice(-3) + result; realNum = realNum.slice(0, -3); } else { result = realNum + result; break; } } return `${sign}${result}${decimal ? "." + decimal:""}`;}</code></pre>

Tried to keep it simple

Given a number, please create a function to add commas as thousand separators. addComma(1) // '1'addComma(1000) // '1,000'addComma(-12345678) // '-12,…