How to Deep Copy a JavaScript Object?

To perform a deep copy of a JavaScript object, which means creating a new object with the same properties and values as the original object but with different references, you can use a combination of the Object.assign method and recursion.

Here’s an example implementation:

function deepCopy(obj) {
  if (typeof obj !== "object") return obj;
  let newObj = Array.isArray(obj) ? [] : {};
  for (let key in obj) {
    newObj[key] = deepCopy(obj[key]);
  }
  return newObj;
}

You can use this function like this:

const original = { a: 1, b: { c: 2, d: [3, 4, 5] } };
const copy = deepCopy(original);
console.log(copy); // { a: 1, b: { c: 2, d: [3, 4, 5] } }

This implementation will handle complex data types and nested objects. Note that this method does not handle circular references, so it may cause an infinite loop in such cases.