add class if angular 2 code example

Example 1: Angular 8 ngClass If

[ngClass]="{'my-class': step=='step1'}"

Example 2: add classon ng if

[ngClass]="{'my-class': step === 'step1'}"

Example 3: Angular 8 ngClass If

[ngClass]="{1:'my-class1',2:'my-class2',3:'my-class4'}[step]"