如何在函数javascript中返回2d数组？

Question

这是我的函数代码，我想在“ a”变量中返回2d数组；

var a = [[]];
var b = [[]];
var j = 0;
var i = 0;
let is = 2;
let desiredFields = ['display_name', 'phone'];

function myFunction() {
  console.log('Loading contacts...');
  let timer = new Date().getTime();
  Contacts.getContactsWorker(desiredFields).then((result) => {

    console.log(`Loading contacts completed in ${(new Date().getTime() - timer)} ms.`);
    console.log(`Found ${result.length} contacts.`);
    deger = result.length;
    a = new Array(result.length);
    for (i = 0; i < result.length; i++) {

      for (j = 0; j < 2; j++) {
        if (j == 0) a[i][j] = result[i].display_name;
        if (j == 1) a[i][j] = result[i].phone[0].number;
      }
    }

  });
  return a;
}

这是调用该函数的代码；

getItems(): Array <IDataItem> {
  b = myFunction();
  while (is <= 5) {
    this.items.push({
      id: is,
      name: b[0][0],
      description: b[0][1]
    });
    is = is + 1;
  }
  return this.items;
}

我的代码不正确吗？如何将2d数组发送到函数？