var basically stands for variable; its value can change within the script, as such when hoisting, js will look for another value that me a variable to the same. const basically stands for "constant" as such, the value is fixed. For a short function as such, the value can be fixed!

I see there's a Javascript version of this kata, so this suggestion is resolved.

can you please share your code and mark it as spoiler? I know more JS now

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

During the replace the function is taking the vowel and adding it to the string k before replacing it.

just refresh the page

Very nice link, just forwarded to my colleagues and trainees: thanks flame!

There are advantages in using const in this scenario. For example, because a compiler knows that const variables do not change, it can perform certain optimizations before running the code. The same does not happen with var, since a change is expected at all times. I highly suggest reading this aritcle in StackOverflow for more information, I personally found it very enlightning: http://stackoverflow.com/questions/21237105/const-in-javascript-when-to-use-it-and-is-it-necessary

только const, только хардкор.

Some one helped me with the translation, hope I can get it fixed in two weeks from now since I'm on vacation. Sorry for the inconveniences :)

Marking issue as resolved as the description has now been updated as requested. Thanks again for the feedback.