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 Ruby  |  Question 17 of 22    Print  
How does nil and false duffer?

  
Total Answers and Comments: 2 Last Update: August 18, 2007     Asked by: nancyphilips 
  
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August 18, 2007 01:07:28   #1  
natchiar        

RE: How does nil and false duffer?
The difference of the methods nil and false is shown by executing nil.methods - false.methods and false.methods - nil.methods.

In a Hash, nil cannot be a value, but false can.

It is recommened that a method returns true or false if it is a predicate, and a value or nil otherwise.

A method with suffix ? is usually a predicate, but some built-in functions are not.

 
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August 18, 2007 05:02:49   #2  
Manikandan Mca        

RE: How does nil and false duffer?
False is a boolean datatype
Nil is not a data type

 
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