<pre class="shiki github-dark shaku"><code>/** * @param {HTMLElement} rootA * @param {HTMLElement} rootB - rootA and rootB are clone of each other * @param {HTMLElement} nodeA */const findCorrespondingNode = (rootA, rootB, target) =&gt; { // Recursive Approach // if(rootA === target) return rootB; // for(let i=0; i&lt;rootA.children.length; i++) { // let result = findCorrespondingNode(rootA.children[i], rootB.children[i], target); // if(result) return result; // } //Iterative Approach const queueA = []; const queueB = []; queueA.push(rootA); queueB.push(rootB); while(queueA.length &gt; 0) { let nodeA = queueA.shift(); let nodeB = queueB.shift(); if(nodeA === target) { return nodeB; } for(let i=0; i&lt;nodeA.children.length; i++) { queueA.push(nodeA.children[i]); queueB.push(nodeB.children[i]); } }}</code></pre>