<pre class="shiki github-dark shaku"><code>/** * @param {number[]} arr * @returns number */function findSingle(arr) { return arr.reduce((prev, curr) =&gt; prev ^ curr, 0)}</code></pre>

O(n), O(1)

Given an array of integers, all integers appear twice except one integer, could you quickly target it ? const arr = [10, 2, 2 , 1, 0, 0, 10]findSingle…