ruby - 如何打破 while = gets

Question

我想像这样运行这段代码

count = Hash.new(0)

while line = gets
  words = line.split
  words.each do |word|
    count[word] += 1
  end
end

count.sort{|a, b|
  a[1] <=> b[1]
}.each do |key, value|
  print "#{key}: #{value}\n"
end

但我不知道如何破解。点击 Command+C 返回

word_count.rb:3:in `gets': Interrupt
from word_count.rb:3:in `gets'
from word_count.rb:3:in `<main>'

如何修复此代码？

Answer 1

您还可以捕获发送到进程的信号Ctrl+C:

 count = Hash.new(0)
 trap("SIGINT") { 
   count.sort{|a, b|
     a[1] <=> b[1]
   }.each do |key, value|
     print "#{key}: #{value}\n"
   end
   exit!
 }
 while line = gets
   words = line.split
   words.each do |word|
     count[word] += 1
   end
 end

引用documentation of Ruby Signal