我正在使用哈希映射来按位置推进角色:"a"进入"b"等等,以及大写元音.
def LetterChanges(str)
str.to_s
puts str
h = ("a".."z").to_a
i = ("b".."z").to_a.push("a")
hash = Hash[h.zip i]
new_str = str.downcase.gsub(/[a-z]/,hash)
new_str.gsub!(/[aeiou]/) {|n| n.upcase }
end
LetterChanges("hello world")
LetterChanges("sentence")
LetterChanges("replace!*")
LetterChanges("coderbyte")
LetterChanges("beautiful^")
LetterChanges("oxford")
LetterChanges("123456789ae")
LetterChanges("this long cake@&")
LetterChanges("a b c dee")
LetterChanges("a confusing /:sentence:/[ this is not!!!!!!!~")
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上面的代码按预期工作,除了示例"replace!*"和"123456789ae"它返回的代码nil.为什么是这样?