What it does

Lifecycle hook that is called after data-bound properties of a directive are initialized.

How to use

.

@Component({selector: 'my-cmp', template: `...`})
class MyComponent implements OnInit {
  ngOnInit() {
    // ...
  }
}

Interface Description

ngOnInit is called right after the directive's data-bound properties have been checked for the first time, and before any of its children have been checked. It is invoked only once when the directive is instantiated.

See Lifecycle Hooks Guide.