Ruby - 相當於Python __str __（）方法？

Question

在Ruby中，是否有相當於您可以在Python類上定義的__str__()方法？

Answer 1

你可以使用to_s。

http://briancarper.net/2006/09/26/ruby-to_s-vs-to_str/

Answer 2

關於核心類，它通常是「檢查」。

如：

irb(main):001:0> puts "array is: #{[1,2,3].inspect}" 
array is: [1, 2, 3] 
=> nil 
irb(main):002:0> puts "array is: #{[1,2,3]}" 
array is: 123 
=> nil 
irb(main):003:0> 

Answer 3

FWIW，檢查可能更喜歡__repr__()比__str__()

從圖書館參考...

再版（個體經營）

Called by the repr() built-in function and by string conversions (reverse quotes) to compute the ``official'' string representation of an object. If at all possible, this should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment). If this is not possible, a string of the form "<...some useful description...>" should be returned. The return value must be a string object. If a class defines __repr__() but not __str__(), then __repr__() is also used when an ``informal'' string representation of instances of that class is required.