Intermediate Algorithm Scripting - Steamroller

JavaScript
1

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]]]])

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Challenge: Intermediate Algorithm Scripting - Steamroller

Link to the challenge:

2

Why did you change the name of the function?

3

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?

4

Yes

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]
etc...

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!

5

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