How to “walk” inside two arrays using the same *ngFor?

Question

Basically I have two arrays, and I would like to store their values at the same time using a *ngFor, I did something like this just to show what I would expect:

Answer 1

I think your issue is here:

addAlternativeField() {
        this.alternativeFields.push(this.fbuilder.control(''));
        this.alternativeFieldsValues.push(this.fbuilder.control(''));
      }

You are patching the arrays in direct reference to this. Isn't it supposed to be

this.form.get('alternativeFields').push(this.fbuilder.control(''))

Or do you have an additional getter?