Using forEach in an array to find an object and change it's value in TypeScript

Question

I have a statement like so:

private updateVariable(anId:number): void {

    this.model.forEach(q => 
        {
            q.anId === anId && (q.isUpdated = !q.isUpdated)
        });

The model is defined as:

private model:Array<IMyData> = [];

Also IMyData is defined with this:

export interface IMyData{
    anId:number;
    isUpdated:boolean;
}

The goal is to iterate over the data to find the matching anId and:

change isUpdated from:

null and false to true

and from:

true to false

Thanks in advance.

Why do you need to use forEach when you can do it using filter? — Kiran Shakya
– Kiran Shakya, Commented Oct 15, 2020 at 6:37
If you don't mind null being changed to false, you could just write q.isUpdated = q.isUpdated ^ (q.anId === anId) — Nick
– Nick, Commented Oct 15, 2020 at 6:42
This code doesn't look bad, what's wrong with it? You didn't say what the problem is — Jeremy Thille
– Jeremy Thille, Commented Oct 15, 2020 at 6:42

KShewengger · Accepted Answer · 2020-10-15 07:02:49Z

1

You can do it in 1 line instead. Using Array's .map()

const anId = '123';

this.model = this.model.map(item => item.anId === anId ? {...item, isUpdated: !item.isUpdated} : item)

console.log(this.model);     // to check the array with it's updated data

answered Oct 15, 2020 at 7:02

KShewengger

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