JSFiddle - React, Tailwind, and code Playground

by Vladymyr Shevchuk

JavaScript

const doubleNum = num => {
  const str = num.toString();
  const half = str.slice(str.length / 2);
	console.error(str.length / 2);
  return half + half === str ? num : num * 2;
};

doubleNum('123');
doubleNum('1234');
doubleNum('11111');