Steamroller is this solution valid?

any input is appreciated,

   **Your code so far**
function steamrollArray(arr) {
 let myArr= arr 
 .join(" ")
 .replace(/[\s+\W+]/g," ")
 .replace(/\s+/g," ")
 .split(" ")
if(myArr.length ===2){ 
return myArr
  return => isNaN(arrr)?{}:parseInt(arrr,10))
console.log(steamrollArray([1, [], [3, [[4]]]]))
   **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

Challenge: Steamroller

Link to the challenge:

It’s valid for passing the challenge, but not for flattening arrays. It should not modify stored values in any way.

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