Angular - trackBy with array of primitives

Question

I've read a documentation, I've tried to google it and check with code but still I can't find an answer.

I have an array of string, for example ['Tom', 'Sarah', 'Ben'] . Its content will change dynamically and regularly. I'd like to use a trackBy function with it.

1. Generally, is there sense to do it?
2. If so, how should I use trackBy with such array? I want to avoid converting data to object with id.

Thank you

Answer 1

A typical way is to use index.

html

<div *ngFor="let e of array; trackBy: trackByFunc;">
   ...
</div>

ts

trackByFunc = (index: number, value: string) => index;