how to use conditional class on angular material code example

Example 1: if condition in class angular 8

<i [class]="user.login_status == 1 ? 'fas fa-circle user_active' : 'fas fa-circle user_inactive'" aria-hidden="true"></i>

Example 2: Angular 8 ngClass If

[ngClass]="{'my-class': step=='step1', 'my-class2':step=='step2' }"