ng class in angular

1[ngClass]="{'text-success':person.country === 'UK'}"

1      
2        content_copy
3      
4      <some-element [ngClass]="'first second'">...</some-element>
5
6<some-element [ngClass]="['first', 'second']">...</some-element>
7
8<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>
9
10<some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>
11
12<some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>
13    

1[ngClass]="{'text-success':person.country === 'UK'}"
2

1[class.my_class] = "step === 'step1'"
2

1      
2      ngDoCheck()
3    

1<div *ngFor="let item of items">{{item}}</div>
2