Ruby - How does nil and false duffer?

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Ruby | Question 17 of 22

How does nil and false duffer?

Total Answers and Comments: 3

Last Update: May 19, 2009 Asked by: nancyphilips

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August 18, 2007 01:07:28

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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