ng-on-off-11.ts

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup } from '@angular/forms';

enum Fields {
  Enabled = "enabled"
}

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {

  public form: FormGroup;

  public Fields: typeof Fields = Fields;

  constructor(private _fb: FormBuilder) { }

  public ngOnInit() {
    this.form = this._fb.group({
      [Fields.Enabled]: [true]
    });
  }
}