Right way to clone objects / arrays during setState in React

Question

I start with:

constructor() {
   super();
      this.state = {
         lists: [\'Dogs\',\'Cats\'], 
         items: {Dogs: [{name: \"Snoopy\"}, {name: \"Lola\"         


        

Answer 1

I wanted to add a bit more info about cloning arrays. You can call slice, providing 0 as the first argument:

const clone = myArray.slice(0);

The code above creates clone of the original array; keep in mind that if objects exist in your array, the references are kept; i.e. the code above does not do a "deep" clone of the array contents.