angularjs-track-by

As pointed out in @Eric comment, and after lots of reading and playing around, here is how to use trackBy in angular2 the first thing you need to know its not same syntax as angular1, now you need to separate it from the for loop with a ;. Usage 1: Track by property of object … Read more

On each ngDoCheck triggered for the ngForOf directive, Angular checks what objects have changed. It uses differs for this process and each differ uses the trackBy function to compare the current object with the new one. The default trackBy function tracks items by identity: const trackByIdentity = (index: number, item: any) => item; It receives … Read more