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Exercise 1

We'll use the techniques learned so far in this section to solve the "Reverse Consonants" problem. First, try to solve it using a naive (brute-force) approach.

// Given a string `str`, reverse all the consonants in the
// string and return it. Consonants are all alphabetic characters
// except for the vowels `'a'`, `'e'`, `'i'`, `'o'`, and `'u'`,
// which can appear in both lower and upper cases.
// The consonants can appear more than once in the string.

console.log(reverseConsonants("") === "");
console.log(reverseConsonants("s") === "s");
console.log(reverseConsonants("HELLO") === "LELHO");
console.log(reverseConsonants("leetcode") === "deectole");
console.log(reverseConsonants("example") === "elapmxe");
console.log(reverseConsonants("Consonants") === "sotnonasnC");

// All test cases should log true

Solution

function reverseConsonants(str) {
  const vowels = new Set(['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U']);
  const consonants = [];

  for (let char of str) {
    if (/[a-zA-Z]/.test(char) && !vowels.has(char)) {
      consonants.push(char);
    }
  }

  consonants.reverse();

  let result = '';
  let consonantIndex = 0;

  for (let char of str) {
    if (/[a-zA-Z]/.test(char) && !vowels.has(char)) {
      result += consonants[consonantIndex++];
    } else {
      result += char;
    }
  }

  return result;
}

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