freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/69306364df283fcaff2e1ada.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
69306364df283fcaff2e1ada	Challenge 149: vOwElcAsE	28	challenge-149

--description--

Given a string, return a new string where all vowels are converted to uppercase and all other alphabetical characters are converted to lowercase.

• Vowels are "a", "e", "i", "o", and "u" in any case.
• Non-alphabetical characters should remain unchanged.

--hints--

vowelCase("vowelcase") should return "vOwElcAsE".

assert.equal(vowelCase("vowelcase"), "vOwElcAsE");

vowelCase("coding is fun") should return "cOdIng Is fUn".

assert.equal(vowelCase("coding is fun"), "cOdIng Is fUn");

vowelCase("HELLO, world!") should return "hEllO, wOrld!".

assert.equal(vowelCase("HELLO, world!"), "hEllO, wOrld!");

vowelCase("git cherry-pick") should return "gIt chErry-pIck".

assert.equal(vowelCase("git cherry-pick"), "gIt chErry-pIck");

vowelCase("HEAD~1") should return "hEAd~1".

assert.equal(vowelCase("HEAD~1"), "hEAd~1");

--seed--

--seed-contents--

function vowelCase(str) {

  return str;
}

--solutions--

function vowelCase(str) {
  const vowels = "aeiouAEIOU";
  let result = "";

  for (let char of str) {
    if (vowels.includes(char)) {
      result += char.toUpperCase();
    } else if (/[a-zA-Z]/.test(char)) {
      result += char.toLowerCase();
    } else {
      result += char;
    }
  }

  return result;
}