Ruby 打印哈希键和值
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Ruby print hash key and value
提问by thisisnotabus
I'm trying to print key : value Currently I keep getting errors when I try to run my codes.
我正在尝试打印 key : value 目前，当我尝试运行我的代码时，我不断收到错误消息。
The code:
编码：
output.each do |key, value|
puts key + ' : ' + value
end
I can not figure out a way to do this on the same line. I've tried various implementations, like using the << symbol. I've also played around with print, using multiple puts statements, and appending both values into a string and printing that.
我想不出在同一条线上做到这一点的方法。我尝试了各种实现，比如使用 << 符号。我还玩过打印，使用多个 puts 语句，并将两个值附加到一个字符串中并打印出来。
回答by Charles Caldwell
Depending on the contents of your Hash, you might need to convert the keyto a string since it might be a symbol.
根据 的内容Hash，您可能需要将 转换key为字符串，因为它可能是一个符号。
puts key.to_s + ' : ' + value
Or, what I would suggest doing, use string interpolation:
或者，我建议您使用字符串插值：
puts "#{key}:#{value}"
The reason you are getting an error, if keyis indeed not a string, is because it is trying to call the method +on whatever keyis. If it does not have a +method, you will get an error.
如果key确实不是字符串，则出现错误的原因是它试图+在任何key情况下调用该方法。如果它没有+方法，你会得到一个错误。
