Check if an object exist in an array in Angular 6
Solution 1:
Unfortunately, includes will not work unless it is the same instance. You will need to do something like;
if (!this.categories.some((item) => item.id == newCategory.id)) {
this.categories.push(newCategory);
}
Solution 2:
The solution given by user184994 didn't worked for me, It was only fetching the first element. I tried like this which worked for me.
let data = this.categories.find(ob => ob.id === newCategory.id);
if(data === null){
this.categories.push(newCategory);
}