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Discussion on: Angular: Setters vs ngOnChanges - which one is better?

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reibo_bo profile image
Bo Vandersteene

Ok so if you have a component that uses your code like this

<my-component [email]="email$ | async" 
                               [username]="username$ | async"> </my-component>

If the input of the observables look like this

email$    = -E----
username$  =  ----U--

Then the ngOnChanges will be called first with only email and then with only username so one of the two is undefined. Only the values that are changed are submitted in the SimpleChanges