将红宝石枚举符加入字符串

Question

我有一个产生字符串的Enumerator::Generator实例。我需要将它们连接成一个字符串。

什么是这样做的好方法？我注意到*不起作用。我知道我可以先.map {|x| x}，但这似乎很不习惯

Answer 1

[我认为在这种情况下，我可以使用inject运算符来获取reduce / reduce（对于同一方法的别名，对我来说，reduce的名称更有意义）：

+

作为完整示例：

enum.reduce(:+)
# or, passing in a block
enum.reduce(&:+)

Answer 2

# never used Enumerator::Generator directly, but you called it out specifically
# in your question, and this seems to be doing the trick to get it working
enum = Enumerator::Generator.new do |y|
  y.yield "ant"
  y.yield "bear"
  y.yield "cat"
end

p enum.reduce(&:+) # output: "antbearcat"
# crude example of modifying the strings as you join them
p enum.reduce('') { |memo, word| memo += word.upcase + ' ' }
# output: "ANT BEAR CAT "

编写以下代码

a=["Raja","gopalan"].to_enum #let's assume this is your enumerator

或

p a.map(&:itself).join

输出

p a.to_a.join