Question

I come from the Java world so I was shocked to discover that arrays (http://ruby-doc.org/core/classes/Array.html) does not hava a method contains(object) returning bool.

What is the good way – the Ruby way – of doing that ?

Answer 1

array.include?(obj) → true or false

Returns true if the given object is present in self (that is, if any object == anObject), false otherwise.

a = [ "a", "b", "c" ]
a.include?("b")   #=> true
a.include?("z")   #=> false

This, from the Array class documentation: