Array.push() and unique items

Question

I have a simple case of pushing unique values into array. It looks like this:

  this.items = [];    add(item) {     if(this.items.indexOf(item) > -1) {       this.items.push(item);       console.log(this.items);     }   } 

Seems pretty straight-forward, right? No, as it appears. It doesn't add any values. I am sure it's some kind of silly mistake on my side, but I can't seem to find it.

Answer 1

Yep, it's a small mistake.

if(this.items.indexOf(item) === -1) {     this.items.push(item);     console.log(this.items); }