What is the best method for looping through objects in Angular using TypeScript?

I am encountering an issue while attempting to loop through a complex object using ngFor and the keyvalue pipe. When I try to pass the key as an argument to a function within a component rendered inside the ngFor loop, TypeScript raises an error stating "Argument of type unknown is not assignable to parameter of type string".

<div *ngFor="let item of items | keyvalue">
  <component [onItemUpdate]="onItemUpdate(item.key)"></component>
</div>

Although item.key should always be a string, TypeScript is interpreting it as unknown. How can this problem be properly addressed?

I have contemplated converting the object into an array as a workaround, but that does not address the root issue, which appears to originate from TypeScript itself. Is there a method to specify a type for the key in the keyvalue pipe?

Answer №1

To specify the specific data type for both the key and value when defining an object, you can use the following syntax:

item: { [key: string]: string};

Alternatively, as a temporary solution, consider adjusting the parameter type of the onItemUpdate function to 'any'. Another option is to simply utilize

onItemUpdate(item.key.toString())
.

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