In which case we have to use the NgFor or others
Angular 2 - ngFor vs. ngForOf
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The [ngFor] is not a type safe
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The [NgForOf] is a type Safe
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The [NgFor] directive instantiates a template once per item from iterate
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The [ngFor] and [ngForOf] are actually the selectors of the [NgForOf] directive and it is not two distinct things
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The [ngFor] will be works like as collections
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The [ngForOf] will be works like as generics