<pre class="shiki github-dark shaku"><code>/** * @param {any} x * @return {number} */function mySqrt(x) { // your code here if(isNaN(x) || x&lt;0) return NaN; if(!isFinite(x)) return Infinity; if(x === 0 ) return 0; if( x === 1 || x === 2) return 1; let left = 1, right = x; while( left &lt; right ) { const mid = Math.ceil((right - left) / 2) + left; if(x &lt; mid*mid) right = mid-1; else left = mid; } return left;}</code></pre>