angular reactive forms multiple form groups code example

Example 1: accessing formcontrol from fromgroup

this.myForm.controls["key"]
(or)
this.myForm.get("key")

Example 2: reactive form nested form group

// Reactive Forms Nested formControls
yourFormName: FormGroup = new FormGroup({
  pet: new FormGroup({
    name: new FormControl('', [Validators.required]),
    age: new FormControl('', [Validators.required]),
  }),
  ...
});