fix-string-case.md

Fix string case ^{7 Kyu}

^{LINK TO THE KATA - FUNDAMENTALS}

Description

In this Kata, you will be given a string that may have mixed uppercase and lowercase letters and your task is to convert that string to either lowercase only or uppercase only based on:

• make as few changes as possible.
• if the string contains equal number of uppercase and lowercase letters, convert the string to lowercase.

For example:

solve("coDe") = "code". Lowercase characters > uppercase. Change only the "D" to lowercase.
solve("CODe") = "CODE". Uppercase characters > lowecase. Change only the "e" to uppercase.
solve("coDE") = "code". Upper == lowercase. Change all to lowercase.

Good luck!

Solutions

const solve = str => {
  const uppercaseCount = (str.match(/[A-Z]/g) || []).length
  const lowercaseCount = str.length - uppercaseCount

  return uppercaseCount > lowercaseCount ? str.toUpperCase() : str.toLowerCase()
}

const solve = str => {
  let uppercaseCount = 0
  let lowercaseCount = 0

  for (let i = 0; i < str.length; i++) {
    str[i] === str[i].toUpperCase() ? uppercaseCount++ : lowercaseCount++
  }

  return uppercaseCount > lowercaseCount ? str.toUpperCase() : str.toLowerCase()
}