How does nil and false differ?

nancyphilips
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Mar 26th, 2007
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natchiar

Aug 18th, 2007

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.

Manikandan Mca

Aug 18th, 2007

False is a boolean datatype
Nil is not a data type

kalyan.allampalli
Profile Answers by kalyan.allampalli

May 19th, 2009

In Ruby nil is an Object for NilClass,

You can directly check as nil.class?it will return NilClass.

Where as false is an object for FalseClass.