Angular FormArray的控件，如何获取摘要？

<form [formGroup]="myForm">
  <div formArrayName="myArray">
    <div *ngFor="let control of myForm.get('myArray').controls; let i = index">
      <input [formControlName]="i">
    </div>
  </div>
</form>

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

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
  myForm: FormGroup;

  constructor(private fb: FormBuilder) { }

  ngOnInit() {
    this.myForm = this.fb.group({
      myArray: this.fb.array([])
    });
  }

  getFormArraySummary() {
    const formArray = this.myForm.get('myArray') as FormArray;
    const summary = formArray.value.map(control => control.value).join(', ');
    console.log(summary);
  }
}