ngfor - Read For Learn

How to use `trackBy` with `ngFor`

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: It receives the current item and should return some value. Then … Read more

ngFor with index as value in attribute

I would use this syntax to set the index value into an attribute of the HTML element: Angular >= 2 You have to use let to declare the value rather than #. Angular = 1 Here is the updated plunkr: http://plnkr.co/edit/LiCeyKGUapS5JKkRWnUJ?p=preview.