[ngClass]="{'class': true}" code example
Example 1: Angular 8 ngClass If
[ngClass]="{'my-class': step=='step1'}"
Example 2: add classon ng if
[ngClass]="{'my-class': step === 'step1'}"
[ngClass]="{'my-class': step=='step1'}"
[ngClass]="{'my-class': step === 'step1'}"