Ruby Quicktips

all? and any?

With all? and any? you can check, if all or any elements of an Array or Hash (or any other class that includes the Enumerable module) match a certain criteria. The result is either true or false.

%w{ ant bear cat}.all? {|word| word.length >= 3} #=> true
%w{ ant bear cat}.all? {|word| word.length >= 4} #=> false
[ nil, true, 99 ].all?                           #=> false

%w{ ant bear cat}.any? {|word| word.length >= 3} #=> true
%w{ ant bear cat}.any? {|word| word.length >= 4} #=> true
[ nil, true, 99 ].any?                           #=> true

All examples taken from the Ruby rdoc documentation.