index.js

const arr = [1,2,3,4];
let newArr = [];

const fetchMock = (item) =>
  new Promise(resolve => setTimeout(() => resolve(item), 500));

function someFunc() {
  [1,2,3,4].forEach(async (item) => {
    const result = await fetchMock(item);
    newArr.push(result);
    console.log(newArr);
  });
  
  console.log('me first');
}

someFunc()