Deep Clone Object

Creates a deep copy of an object, handling nested objects, arrays, and circular references. More robust than JSON.parse/stringify.

JavaScript7/16/2025

#utilities#objects#deep-copy

JavaScript

function deepClone(obj, visited = new WeakMap()) {
  if (obj === null || typeof obj !== 'object') return obj;
  if (visited.has(obj)) return visited.get(obj);
  
  if (obj instanceof Date) return new Date(obj);
  if (obj instanceof Array) {
    const copy = [];
    visited.set(obj, copy);
    obj.forEach((item, index) => {
      copy[index] = deepClone(item, visited);
    });
    return copy;
  }
  
  const copy = {};
  visited.set(obj, copy);
  Object.keys(obj).forEach(key => {
    copy[key] = deepClone(obj[key], visited);
  });
  return copy;
}

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