Array with strings on the basis of another array with objects [JS/TypeScript]

Question

I would like to create new array with strings on the basis of existing array with objects, where Employee class includes firstName field:

assignees: Array<Employee>;
options: string[];

I tried do this in this way:

this.options = this.assignees.forEach(value => value = value.firstName);

But type 'void' is not assignable to type 'string[]'

Could someone please assist?

Answer 1

The forEach() method just executes a provided function once for each array element.

You could try to do it with map() . That's I guess is the right way to do such tasks.

// here is how it could look like
this.options = this.assignees.map(value => value.firstName);

The map() method creates a new array with the results of calling a provided function on every element in the calling array.

Happy hacking :)