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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
That's because at some point you're returning undefined.
Such a clean way of doing it; really shows the simplicity of arrow functions when used correctly!
Ok, I'll put this in the description!
I agree, it should specify whether it was sorted or not - I did it assuming the input array was unsorted.
This comment is hidden because it contains spoiler information about the solution
The description is relatively non-specific; it'd be great if it described the input array in greater detail. (e.g. I couldn't tell from the instructions that the array might not be pre-sorted in ascending order).
The submission tests still appear to be broken. 3 tests passed, but on the fourth, 'TypeError: Cannot call method 'join' of undefined'
The ternary operator isn't required here - you just need to return (exes === ohs) :)