Defined?, And, Or, and Not : defined « Method « Ruby

1. Ruby
2. Method
3. defined

Defined?, And, Or, and Not

defined? 1 # "expression" 
defined? dummy # nil 
defined? printf # "method" 
defined? String # "constant" 
defined? $_ # "globalvariable" 
defined? Math::PI # "constant" 
defined? a = 1 # "assignment" 
defined? 42.abs # "method" 

 

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