Ruby - if and unless Modifiers

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Introduction

You may recall the alternative syntax for while loops mentioned. Instead of writing this: 

while tired do sleep end

you can write this: 

sleep while tired

This alternative syntax is called a while modifier.

Ruby has if and unless modifiers too. Here are a few examples: 

sleep if tired 

begin  
   sleep  
   snore 
end if tired 

sleep unless not tired 

begin  
   sleep  
   snore 
end unless not tired

You might, for example, use the if statement as follows: 

puts( "somevar = #{somevar}" ) if DEBUG

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