angular initail valeur in fromgroup
we are creating FormGroup as following. userForm = new FormGroup({ name: new FormControl(), age: new FormControl() }); 1. Using setValue() this.userForm.setValue({name: 'Mahesh', age: '20' }); It is necessary to mention all from controls in setValue() otherwise it will throw error. 2. Using patchValue() this.userForm.patchValue({name: 'Mahesh'}); When we use patchValue() then it is not necessary to mention all form controls.