What is true?

Posted by tom March 20th, 2006

This is one I needed to write down, in case I forget: In Ruby any value that is not nil or false is true.

So the following Ruby program: 

puts “nil is true” if nil 
puts “false is true” if false
puts “true is true” if true
c = ”” 
puts ”\”\” is true” if c
puts “0 is true” if 0

	
c = ”” 
if( c == ”” ) then
  puts “yeah” 
end



if( c ) then
  puts “yep!” 
end
will output: 
true is true
"" is true
0 is true
yeah
yep!
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