numer of vowels in string

numberOfVowelsInString.swift

    //First Implementation
    func numberOfVowelsInString(string: String) -> Int {
        let vowels: [Character] = ["a", "e", "i", "o", "u", "A", "E", "I", "O", "U"]
        
        var numberOfVowels = 0
        
        for character in string.characters {
            if vowels.contains(character) {
                numberOfVowels += 1
            }
        }
        
        return numberOfVowels
    }
    
    //Second Implementation
    func numberOfVowelsInString(string: String) -> Int {
        
        let vowels: [Character] = ["a", "e", "i", "o", "u", "A", "E", "I", "O", "U"]
        
        return string.characters.reduce(0) { $0 + (vowels.contains($1) ? 1 : 0) }
    }