How to beautifully pick up all array elements in an array?

Question

JavaScript

There is an array arrand in it a couple more arrays 0_arrand 1_arr. I need to transfer everything that is in the array arrto a new array arrNewwithout grouping into arrays. How to make it beautiful? So far, only this option has come to mind, but something tells me that it is crooked.

let arrNew = [];
arr.forEach(function(item) {
  item.forEach(function(item) {
    arrNew.push(item);
  });
});

Answer 1

This?

arr = 
console.log ( arr.flat() )

this is a relatively new method, there are "alternatives"
https://developer.mozilla.org/en/docs/Web/JavaScri...