Please use apoiler flag.

The .5 part is just genius

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!

that is so cool...

where is the downvote button?

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

it's not recursive solution

My solution now works. It's the same as the best practice solution for JavaScript so I won't post it again here. Thanks for fixing it.

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

Change the kata description. It's unbearable to see how you have to re-read it, and look at the sample tests' arguments and expected results just to grasp the idea that the S, which you need to plug into the t = S/V formula, equals to 400.

Javascript translation created

Where does "new Canvas" come from? I'm assuming this is an node package?

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.