The value in list[0].language can be anything, but as he specified the [0] index and the loop runs through every object, it will only return true if all the other objects has the same language of the [0] index

You must be kidding me with this description lol

Here's the perfect explanation about reduce: https://javascript.info/array-methods#reduce-reduceright

Very fun kata!

Improve the description of the 2nd paragraph by adding something like: "these are the functions from the library available to be used, NOT the steps order".

Great kata, very enjoyable

That was a fun kata!

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

Takes an array and spreads it out over several arguments.

The description really messes with you LOL, only after reading the tests I understood.

LMAO

They are required if you have multiple arguments or no arguments, in this case, it wasn't required but he put it anyway.

LMAO