OP solved it, closing

see this to format your code

Read this: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array there is one method that will be useful.

Remove those double quotes, and check this:

Note that name will be an array consisting of one or more values that should be joined together with one space between each

Your code would work only with two values.

Hi. Please use a spoiler flag when you post code (I put the flag for you this time). Without knowing which is the input, it's impossible to say anything. However it's extremely unlikely your code returns something in an IDE and something different here with the same input. You are most probably doing something wrong or misunderstanding something. Please refer to the documentation where you can find some helpful tips: https://docs.codewars.com/training/troubleshooting/