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

es6,spread_operator_javascript

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))

Remove array of objects from another array of objects

Using promises to catch errors

Đếm số phần tử trong mảng JavaScript

using async/await to catch errors

Đếm có bao nhiêu items giống nhau trong một array