Where is recursion used in real JavaScript applications?
JSON tree rendering (recurse on values), file explorer (recurse on children), nested comments (recurse on replies), deep clone (recurse on object properties), and DOM traversal (recurse on childNodes). Any nested or self-similar structure.
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More FAQs in Recursion: Real-World Applications in JavaScript
function deepClone(obj) { if (obj === null || typeof obj !== 'object') return obj; const clone = Array.isArray(obj) ? [] : {}; Object.keys(obj).forEach(key => clone[key] = deepClone(obj[key])); return clone; }
function renderComment(comment, depth) { /* render comment */ comment.replies.forEach(reply => renderComment(reply, depth + 1)); }. Each comment recurses into its replies, indenting by depth.
function search(node, text, results = []) { if (node.textContent.includes(text)) results.push(node); node.children.forEach(child => search(child, text, results)); return results; }. Recurse into children and accumulate matches.
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