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?

because forEach function doesn't return anything. Use map instead — Manoz
– Manoz, Commented Oct 1, 2018 at 11:22

ikos23 · Accepted Answer · 2018-10-01 11:27:35Z

2

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 :)

answered Oct 1, 2018 at 11:22

ikos23

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