Question

我是学习Ruby的新手。在下面的代码中，我犯了一个错误，写了一个错误的单词＆＃39; hash＆＃39;而不是movies＆＃39;。但我发现它也是正确的方式.WHY这发生了有人可以帮我解释一下吗？

movies = {:Frozen => 9}
puts "input a movie title:"
title = gets.chomp
puts "the rating of the movie:"
rating = gets.chomp
if hash[title.to_i].nil?  #here,i wrote 'hash' instead of 'movies'
  movies[title.to_sym] = rating.to_i
  puts "Added successfully!"
else
  puts "The movie already exists."
end

这些是我的输入和运行结果：

为什么hash[title.to_i]似乎不是零，仍然会发出＆＃39; The movie already exists.＆＃39; ？

input a movie title:
Frozen
the rating of the movie:
4
The movie already exists.

Answer 1

您正在调用hash

的main方法

p self  # => main
p self.methods.sort #=> [:!, :!=, :! ... :hash,...]
p self.hash # => -1928951575263865998

当调用错误的哈希名称时为什么会进入正确的分支？

1 个答案: