how to use track by inside ngFor angular 2

Question

tried every syntax i can guess couldnt make it works !

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Answer 1

As you already recognized, using a function is the only way to use trackBy in Angular 2

The official documentation states that https://angular.io/docs/ts/latest/api/common/index/NgFor-directive.html

All the other information about is wrong. Starting with Angular 2.4.1 this will also throw an error in the application.