Increment ngClass value

Question

How to increment a class numeric value using ngClass?

e.g. - <some-element [ngClass]="'class-*'">...</some-element> , where * should auto-increment until met conditions.

Answer 1

i:number = 0;

<some-element [ngClass]="'class-'+ i">...</some-element>
<button (click)="i = i+1">increment</button>

(I'm not sure if i++ work in a template)