ruby - Difficulty understanding optional parentheses -

i having problem understanding execution in following code snippet.

x = 5 puts (0..10).include?(x) ? "yes" : "no" 

it giving desired output yes. when omitting parentheses of include? method :

x = 5 puts (0..10).include? x ? "yes" : "no" 

then output false. using ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]

that because in second case ruby takes result of whole x ? "yes" : "no" expresion argument.

 puts (0..10).include? x ? "yes" : "no" 

is equivalent to:

 puts (0..10).include?(x ? "yes" : "no") 

ruby allows omit brackets method calls, there cases, when it's impossible omit them write you've intended.