<pre class="shiki github-dark shaku"><code>/** * @param {number[]} arr * @returns number */function findSingle(arr) { const set = new Set(); arr.forEach((item) =&gt; { if (set.has(item)) { set.delete(item); } else { set.add(item); } }) return set.values().next().value;}</code></pre>

With Set()

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…