Intermediate Algorithm Scripting - Steamroller

Tell us what’s happening:

Based on the output of each test, I have passed this challenge. However, I continue to fail all tests except for the one regarding using the .flat() and .flatmap() methods. I’m also failing the test for using global variables.

I need some help about why this is happening. I’m wondering if the second argument to the reduce function (“[ ]”) is perhaps triggering the global variable check? Let me know your thoughts! Thanks!

Your code so far

function flatten(arr) {
  return arr.reduce((previous, current) => {
      if (Array.isArray(current)) {
        return [...previous, ...flatten(current)]
      } else {
        return [...previous, current]
  }, [])

flatten([1, [], [3, [[4]]]])

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Challenge: Intermediate Algorithm Scripting - Steamroller

Link to the challenge:

Why did you change the name of the function?

no reason specifically. I was simply just writing code in another editor and that the was the name I gave. would this cause the issue?


Look very carefully at the test cases

steamrollArray([[["a"]], [["b"]]]) should return ["a", "b"].
steamrollArray([1, [2], [3, [[4]]]]) should return [1, 2, 3, 4]

They were written with a specific function name in mind. If you change it, then the tests fail because it wasn’t written with flatten in mind.

Hope that helps!