Is there something like a Safe Navigation Operator that can be used on Arrays?

Question

I have used Safe Navigation Operator for Objects to load on Asynchronous calls and it is pretty amazing. I thought I could reproduce the same for Arrays but it displays a template parse error in my Angular code. I know *ngIf is an alternative solution, but is there a more simpler(by code) way just like the Safe Navigation Operator?

<div class="mock">
   <h5>{{data?.title}}</h5>  //This works
   <h6>{{data?.body}}</h6>  //This works
   <h6>{{simpleData?[0]}}</h6>  // This is what I tried to implement    
</div>

Answer 1

Is there something like a Safe Navigation Operator that can be used on Arrays?

Yes, what you are looking for is known as the Optional Chaining operator (JavaScript / TypeScript).

The syntax shown in the MDN JavaScript documentation is:

obj.val?.prop
obj.val?.[expr]
obj.arr?.[index]
obj.func?.(args)

So, to achieve what you want, you need to change your example from:

<h6>{{simpleData?[0]}}</h6>

To:

<h6>{{simpleData?.[0]}}</h6>
                 ^

Also see How to use optional chaining with array in Typescript?.

Answer 2

is there a more simpler(by code) way just like the Safe Navigation Operator?

There is ternary operator.

condition ? expr1 : expr2

<h6>{{simpleData?simpleData[0]:''}}</h6>   

Answer 3

Of cause it's a matter of taste, but in such cases I tend to use a shorter approach:

<h6>{{(simpleData || [])[0]}}</h6>