javascript - Deep copy an array in Angular 2 + TypeScript

Question

I have an array of objects that is an input. Lets call it content.

When trying to deep copy it, it still has a reference to the previous array.

I need to duplicate that input array, and change one property of the duplicated part.

So long I've tried different methods that weren't successful.

ES6 way:

public duplicateArray() {
  arr = [...this.content]
  arr.map((x) => {x.status = DEFAULT});
  return this.content.concat(arr);
}

The slice way:

public duplicateArray() {
  arr = this.content.slice(0);
  arr.map((x) => {x.status = DEFAULT});
  return this.content.concat(arr);
}

In both of them all the objects inside the array have status: 'Default'.

What's the best approach to deep copy the array in Angular 2?

Answer 1

Check this:

  let cloned = source.map(x => Object.assign({}, x));