The recursion solution i came up with for the Steamroller problem is not being accepted

JavaScript
#1

Tell us what’s happening:
i am trying to solve this challenge, i approached this problem with a recursion and when i console log the result seems fine but freecodecamp is not accepting it.

Your code so far


function steamrollArray(arr) {
let result = []
let index = [];
let obj = []
if(!Array.isArray(arr)){

  result.push(arr)
}
else {

  arr.map(item=>{
    
    if(item == '[object Object]'){
      index.push(JSON.stringify(item))
    }
    else{
      
    index.push(steamrollArray(item))
    }
    
    
  })
}


result+=index
obj = result
console.log(obj)
return obj;
}

steamrollArray([1, {}, [3, [{},[4]]]]);

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36.

Challenge: Steamroller

Link to the challenge:

#2 
const result = steamrollArray([[["a"]], [["b"]]]);
console.log(result) // a, b
console.log(typeof result); // string

Because you’re returning a string, not an array.

The test says:

steamrollArray([[["a"]], [["b"]]]) should return ["a", "b"].

The result must be an array. Flattening an array means you end up with an array.

1 Like
#3

oh wow , so all i need to do is change it to array? thanks for the reply

#4

Not really. Your solution needs a bit of work.
Start with an empty array.
Filter the given array and push the values you want to keep into the newly created one.
Try that if you like.

1 Like
#5

I think most solutions never create it as a string in the first place. For most solutions, they just have an array and push on the elements as they’re found.