Method Calls and Parentheses

 
   

Ruby Way
By Hal Fulton
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Table of Contents
 


Ruby does not always require the use of parentheses to evaluate methods, unless it's necessary to avoid ambiguities.

 

 def f(x)  print x**2 end f 3     # 9 

However, if parentheses are used near a method, then Ruby will associate them with the method and expect an argument list inside. An expression is a valid argument.

 

 f (2+3)*4   # 100 f((2+3)*4)   # 576 


   

 

 



The Ruby Way
The Ruby Way, Second Edition: Solutions and Techniques in Ruby Programming (2nd Edition)
ISBN: 0672328844
EAN: 2147483647
Year: 2000
Pages: 119
Authors: Hal Fulton

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