How to use the spread operator to flatten array of objects in javascript

function flatten(arr) {
  while (arr.some((item) => Array.isArray(item))) {
    arr = [].concat(...arr)
  }
  return arr
}
let arr = [1, 2, [3, 4], [5, [6, 7]]]
console.log(flatten(arr))

using async/await to catch errors

Await in a for loop

How to Await in a for loop

Using promises to catch errors

Rest Operator for Objects

Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

How to use the spread operator to flatten array of objects in javascript