在Ruby中，你可以使用lambda或proc调用方法来调用迭代器吗？

我想创建一个迭代器，我可以传递给方法来调用。

#!/usr/bin/env ruby puts "------------------------------------" puts "1 This works." puts "------------------------------------" 1.times {|who| puts "Position #{who} works!"} puts "------------------------------------" puts "2 This works." puts "------------------------------------" aBlock = Proc.new { |who| puts "Position #{who} also works!" } 2.times &aBlock puts "------------------------------------" puts "3 This works." puts "------------------------------------" def eachIndex 3.times { |i| yield i } end eachIndex &aBlock puts "------------------------------------" puts "4 This does not work." puts "------------------------------------" iterator = lambda { |name| yield name } iterator.call(4) {|who| puts "Does not work #{who}:-("} puts "------------------------------------" puts "5 This does not work." puts "------------------------------------" iterator = lambda { |name,&block| yield name } iterator.call(5) {|who| puts "Does not work #{who}:-("} puts "------------------------------------" puts "6 This does not work." puts "------------------------------------" iterator = Proc.new { |name,&block| yield name } iterator.call(6) {|who| puts "Does not work #{who}:-(" } 

lambda或proc是Ruby中的迭代器吗？ 我想将它们作为参数传递给一个类。

Answer 1

这是做到这一点的方法

 iterator = -> (name, &block) { block.call name } iterator.call(4) { |who| puts "It works now #{who} :)" } 

PS注意我在这里使用一个lambda的快捷方式， ->称为stabby lambda