Correct-the-mistakes-of-the-character-recognition-software.js

/*
  Character recognition software is widely used to digitise printed texts. Thus the texts can be edited, searched and stored on a computer.

  When documents (especially pretty old ones written with a typewriter), are digitised character recognition softwares often make mistakes.

  Your task is correct the errors in the digitised text. You only have to handle the following mistakes:

  S is misinterpreted as 5
  O is misinterpreted as 0
  I is misinterpreted as 1
  The test cases contain numbers only by mistake.
*/

// Answer:

const map = {
  0: `O`,
  5: `S`,
  1: `I`,
}
function correct(string)
{
	return string.split('').map(char => map[char] ? map[char] : char).join('')
}

// BigO: O(n)