ngclass and ngstyle in angular code example

Example 1: ngclass angular

<div [ngClass]="{ 
'green': number > 5,
  'red': number <= 5,
}" ></div>
//if the number is over 5, the class 'green' will be added to the div.
//if the number is below or equal 5, the class 'red' will be added to the div.

Example 2: ngClass

[ngClass]="step == 'step1' ? 'my_class1' : 'my_class2'"