我如何计算元音? [英] How do I count vowels?

问题描述

我已经看到了解决方案，它或多或少是匹配的

I've seen the solution and it more or less matches

Write a method that takes a string and returns the number of vowels
 in the string. You may assume that all the letters are lower cased. You can treat "y" as a consonant.
Difficulty: easy.

def count_vowels(string)
    vowel = 0
    i = 0
    while i < string.length  
        if (string[i]=="a" || string[i]=="e" || string[i]=="i" || string[i]=="o"|| string[i]=="u")
            vowel +=1
end

    i +=1

return vowel

end

puts("count_vowels(\"abcd\") == 1: #{count_vowels("abcd") == 1}")
puts("count_vowels(\"color\") == 2: #{count_vowels("color") == 2}")
puts("count_vowels(\"colour\") == 3: #{count_vowels("colour") == 3}")
puts("count_vowels(\"cecilia\") == 4: #{count_vowels("cecilia") == 4}")

推荐答案

def count_vowels(str)
  str.scan(/[aeoui]/).count
end

/[aeoui]/ 是一个正则表达式，基本上表示这些字符中的任何一个:a、e、o、u、i".String#scan 方法返回字符串中正则表达式的所有匹配项.

/[aeoui]/ is a regular expression that basically means "Any of these characters: a, e, o, u, i". The String#scan method returns all matches of a regular expression in the string.

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