[Codewars] Regexp Basics - is it a digit? (8 kyu) / JavaScript

https://www.codewars.com/kata/567bf4f7ee34510f69000032

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DESCRIPTION:

Implement String#digit? (in Java StringUtils.isDigit(String)), which should return true if given object is a digit (0-9), false otherwise.

 

코드

String.prototype.digit = function() {
  return /^\d{1}$/.test(this);
};