將數組數組轉換爲字符ruby

Question

to_chr函數應該返回加密數組，但轉換爲字符。我已經嘗試了很多東西，並將那些不起作用的東西評論出來。

class Encrypt 
    def initialize(code, string) 
    @code = code 
    @string = string 
    @encrypted = [] 
    end 

    def to_byte 
    @string.each_byte do |c| 
     @encrypted.push(c + @code) 
    end 
    print @encrypted 
    end 

    def to_chr 
    n = @encrypted.length 
    # n.times do |i| 
    # @encrypted.push(i.chr) 
    # end 
    print @encrypted[0].chr 

    # @encrypted.each do |x| 
    # @encrypted.push(x.chr) 
    # end 
    # print @encrypted 
    end 
end 

goop = Encrypt.new(2, "hello") 
goop.to_chr 
#=> in `to_chr': undefined method `chr' for nil:NilClass (NoMethodError) 

Answer 1

創建Encrypted方法的實例，但設置@code = 2，@string = "Hello"和@encrypted = []。所以如果你撥打@encrypted[0]，ruby會返回nil。

所以，你可以修改你的類是這樣的：

class Encrypt 
    def initialize(code, string) 
    @code, @string, @encrypted = code, string, [] 
    end 

    def to_byte 
    @string.each_byte { |c| @encrypted << c + @code } 
    end 

    def to_chr 
    to_byte if @encrypted.empty? 

    @encrypted.map(&:chr) 
    end 
end 

goop = Encrypt.new(2, "hello") 
p goop.to_chr 
# => ["j", "g", "n", "n", "q"] 

我希望這有助於

Answer 2

def to_chr 
    @encrypted.each do |i| 
     print i.chr 
    end 
    print "\n" 
end 

確保調用to_byte之前to_chr

goop = Encrypt.new(2, "hello") 
goop.to_byte 
goop.to_chr 

回報：

jgnnq