[Codewars] Fake Binary (8 kyu) / JavaScript

https://www.codewars.com/kata/57eae65a4321032ce000002d

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DESCRIPTION:

Given a string of digits, you should replace any digit below 5 with '0' and any digit 5 and above with '1'. Return the resulting string.

Note: input will never be an empty string

 

코드

function fakeBin(x){
  return x.split('').map(el => el < 5? '0' : '1').join('');
}