There's a better way to loop the arr only once.

no hardcoded value please

Learned something new. Thank you!

This description is too bloated.

similar to mine. only suggestion is to dynamically generate the alphabets map.

return sum = 0 by default then

you can use '_' instead, it just a placeholder

Basically this Kata required us to create a polyfill filter method, if the client's browser doesn't support modern JavaScript

Mine is similar, with a little tweak on checking if there's no matched return

nice!

this is easy to read