Steamroller code works but not on FreeCodeCamp

JavaScript
1

Tell us what’s happening:
My code works, yet it doesn’t work on FreeCodeCamp. Can anyone help?

Your code so far


var newarr=[];
function steamrollArray(arr) {
  // I'm a steamroller, baby
  
  for (let i=0; i<arr.length;i++){
    if (Array.isArray(arr[i])){
      steamrollArray(arr[i])
    } else {
      newarr.push(arr[i]);
    }
  }
  return newarr;
}

console.log(steamrollArray([1, [2], [3, [[4]]]]));

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller

2

The function steamrollArray gets called over and over again in the tests. What is the value of newarr the second (and third and fourth…) time the function is called? (Hint: it’s not [])

To put it another way, the task is to write a function that flattens an array. I can see the variable newarr isn’t part of that function, it’s just kinda floating around outside it. If I delete that variable, will the function still work?

3

No the function will not work if newarr is deleted. Yes I don’t want to make newarr =[ ] everytime I call the function, that is why I declared it outside.

5

Ok I see. Thanks for your help.