How to identify and empty object and push it to an array

JavaScript
1

I’m working on “Intermediate Algorithm Scripting: Steam Roller”. I can pass all tests except the last, because I am not able to take an empty object { } from an array and push it to an empty array that will contain my final set of elements to be returned.

Here is my algorithm:

function steamrollArray(arr) {
  let box = [];
  let firstArr = [...arr];

  two(firstArr);
  function two(arr2){
  for(let i = 0; i < arr2.length; i++) {
    if(arr2[i] === {} || typeof(arr2[i]) === "number" || typeof(arr2[i]) === "string") { box.push(arr2[i]);}
    else {
    two(arr2[i]);
    
     
    }
    
  }
 // console.log(box);
  }

  return box;

  

}

steamrollArray([1, [2], [3, [[4]]]]);

image
image1420×552 49 KB

The problem in my code lies in this part of my conditional: if(arr2[i] === {}) {box.push(arr2[i])};
I think other elements which are not empty objects are passing this conditional when I do not want them to.

^ Note: I’ve solved the algorithm another way using Array.isArray. I just would like to know how to solve this problem using the method pasted above so I can better understand my error and how to identify an empty object in the future. Thanks in advance…

2 
arr2[i] === {}

This won’t work because when objects are compared, they are only considered equal if they are the same object (as opposed to being equivalent).

That said, I would suggest reconsidering that if statement. You want to take a special action if the item is an array, trying to list all the other things that it could be is not the best way to do that.

3

you may want instead something like…

4

thanks, that makes sense