Count Occurrences

Write a function called countOccurrences() that takes in a string and a character and returns the number of occurrences of that character in the string.

#Basic

const countOccurrences = (str, char) => {
  // Edge case: If either the input string or character is empty, return 0 occurrences.
  if (str.length === 0 || char.length === 0) {
    return 0;
  }

  // Split the string by the character and count the number of resulting parts (segments).
  // The number of segments minus one will give the count of occurrences of the character.
  const occurrences = str.split(char).length - 1;

  return occurrences;
};

// Test cases:
console.log(countOccurrences('hello world', 'l')); // Output: 3
console.log(countOccurrences('aaaa', 'a')); // Output: 4
console.log(countOccurrences('abc', 'd')); // Output: 0 (character 'd' not found)
console.log(countOccurrences('', 'a')); // Output: 0 (empty string)
console.log(countOccurrences('hello', '')); // Output: 0 (empty character)