How to check array object values true or not in typescript or javascript [duplicate]

I have an array objects. Inside that i want to check all selected values are true or not. below code is not working. How to check in typescript or javascript.

  ngOnInit() {
let arr1 = [
  {
    name: 'test1',
    selected: true,
  },
  {
    name: 'test1',
    selected: true,
  },
  {
    name: 'test1',
    selected: true,
  },
];

let arr2 = [
  {
    name: 'test1',
    selected: true,
  },
  {
    name: 'test1',
    selected: true,
  },
  {
    name: 'test1',
    selected: false,
  },
];
console.log(this.checkallTrue(arr1));
console.log(this.checkallTrue(arr2));
   }

   checkallTrue(arr) {
     for (const n of arr) {
      if (n.selected == true) {
       return true;
      } else {
       return false;
      }
      }
     }

Demo: https://stackblitz.com/edit/github-7plax5-ydjwxc?file=src%2Fapp%2Fapp.component.ts