Is it possible to incorporate the spread operator within an Angular template?

Is it possible to utilize the spread operator in an Angular template?

I came across this question and answer. According to the accepted response, using the spread operator in a template is not feasible:

It's unlikely that you're going to get this syntax to work in a template (there are many valid typescript constructs that don't work in templates).

However, another answer I found suggests that it is indeed achievable.

Upon trying to implement it myself, I encountered an error.

Unexpected token ., expected identifier, keyword, or string at column 2 in

I'm looking for clarification. Can the spread operator be used in an Angular template? For instance:

<div> [user]='{...member}'</div> 
<!--where member is an object-->
angulartypescript

Answer №1

As discussed in the question and demonstrated in this stackblitz example, Angular templates currently do not allow the spread syntax. A request has been made in issue 11850 to add support for this feature.

Answer №2

Previously mentioned, Angular does not support the use of the spread operator in templates. However, my custom pipe can help you achieve the same functionality!

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'addPropsToObj'
})
export class AddPropsToObjPipe implements PipeTransform {
  transform(prevObj: { [key: string]: any }, propsToBeAdded: { [key: string]: any }): { [key: string]: any } {
    return { ...prevObj, ...propsToBeAdded };
  }
}

With this pipe, you can now do the following:

 .. [user]="{}|addPropsToObj:member" ..

and receive exactly the desired result:

{ ...member }

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