form control on change code example

Example 1: angular 9 form value changes

this.reactiveForm.get("firstname").valueChanges.subscribe(selectedValue => {
  console.log('firstname value changed')
  console.log(selectedValue)                              //latest value of firstname
  console.log(this.reactiveForm.get("firstname").value)   //latest value of firstname
})

Example 2: get formcontrol value

this.loginForm = new FormGroup({
  'email': new FormControl('', { validators: [Validators.required] })
});
// get like this
const { email } = this.loginForm.value;