// First Attempt

/*
let numberOfVowels = function(data){
  vowels = 0;
  for(let i=0; i<data.length; i++){
    if (data[i] == "a" || data[i] == "e" || data[i] == "i" ||data[i] == "o" ||data[i] == "u" ) {
      vowels += 1;
    }
  } return vowels;
};
*/

// Second Attempt

/*

.indexOf() method returns the first index at which a given element can be can be found in the array, or -1 if it is present

*/

let numberOfVowels = function(str){
  let vowel_list = "aeiouAEIOU";
  let vowels = 0;
  for (let i = 0; i < str.length; i++) {
    if (vowel_list.indexOf(str[i]) !== -1) {
      vowels += 1;
    }
  } return vowels;
}

// Third Attempt
/*
.match() searches a string for a match against a regular expression, and returns the matches

regular expressions is a sequence of characters that forms a search pattern.

syntax is generally

/pattern/modifiers;

*/
function numberOfVowels(str) {
  return (str.match(/[aeiouAEIOU]/ig)||[]).length;
}

console.log(numberOfVowels("orange"));
console.log(numberOfVowels("lighthouse labs"));
console.log(numberOfVowels("aeiou"));