[Codewars] Simple Fun #176: Reverse Letter (7 kyu) / JavaScript

https://www.codewars.com/kata/58b8c94b7df3f116eb00005b

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DESCRIPTION:

Task

Given a string str, reverse it and omit all non-alphabetic characters.

 

Example

For str = "krishan", the output should be "nahsirk".

For str = "ultr53o?n", the output should be "nortlu".

 

Input/Output

• [input] string str

A string consists of lowercase latin letters, digits and symbols.

• [output] a string

 

코드

function reverseLetter(str) {
  return str.replace(/[^a-z]/ig, "").split('').reverse().join('');
}