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Angular 1 and Angular 2 Integration

Angular 2 Component Constructor vs. OnInit event

The constructor is a typescript feature. The constructor is only related to class instantiation and it’s nothing to do with Angular 2 and it is use to some initialization processing with respect to class hierarchies for the newly created instance.


The ngOnInit event is an Angular 2 life-cycle event/ method that are called after the first ngOnChanges. The ngOnInit method is use to parameters defined with @Input otherwise the constructor is OK.


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