Adding Validation in Angular using Reactive Forms

app.component.ts
import {Component, OnInit} from '@angular/core';
import {FormControl, FormGroup, Validators} from '@angular/forms';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  genders = ['male', 'female'];
  signupForm: FormGroup;

  ngOnInit(): void {
    this.signupForm = new FormGroup({
      'username': new FormControl(null, Validators.required),
      'email': new FormControl(null, [Validators.required, Validators.email]),
      'gender': new FormControl('male') // default value for radiobutton => male
    })
    ;
  }

  onSubmit() {
    console.log(this.signupForm);
  }
}
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