apply class based on condition angular code example

Example 1: ngclass condition

[ngClass]="(step=='step1')?'my-class1':'my-class2'"

Example 2: ngclass condition

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

Example 3: Angular 8 ngClass If

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