No prob, I'm glad I could help.

Of course! Thanks for taking the time to help me out. I really enjoyed your kata.

Well, in your function signature you are expecting a single array argument, so no wonder things aren't working the way they should. Calling toTable([["o"]], true, true) in your case gives:

data == ["o"]
header == false
index == false

calling toTable([["lorem", "ipsum"], ["dolor", "sit amet"]], true, true):

data == ["lorem",  "ipsum"]
header == ["dolor", "sit amet"]
index == false

You need to get rid of the square brackets in signature if you want this code to work.

OK, will do. I have jest tests running locally and they all pass with the code as is. Not sure why it doesn't run in the Codewars environment.

Not a kata issue, yes. @jonnybolt: use the "question" flag, for this kind of things. The error comes from your code.

Three days without an answer - I assume that this issue is resolved.

It seems like you are trying to use map on a non-array type, deducting from the fact that this exception raises inside a call to rowData.map. There is no scenario in which there are other arrays inside a single row of the table. To be perfectly sure, I would need to see your code.

TypeError: x.map is not a function
at rowData.map
at Array.map
at toTable
at Test.describe
at /runner/frameworks/javascript/cw-2.js:152:11
at Promise._execute
at Promise._resolveFromExecutor
at new Promise
at Object.describe
at /home/codewarrior/index.js:71:6
at /home/codewarrior/index.js:78:5
at Object.handleError

What error do you get?

Not sure what's going on, but the tests are complaining when I use .map on any arrays. Do I have something misconfigured?

You have to complete a kata, and then you'll be able to translate it to other languages.

How do I modify an existing kata to support another programming language? I just completed a kata in javascript but the only language supported is haskell.