How to use `trackBy` with `ngFor`

Question

I can\'t really understand what I should return from trackBy. Based on some examples I\'ve seen on the web, I should return the value of some property on the ob

Answer 1

This angular NgFor document will help you. https://angular.io/docs/ts/latest/api/common/index/NgFor-directive.html

Below example for your code

 {{user.name}} -> {{user.score}}