what's the meaning of "<<"

rubyonrails-talk
1

# File activerecord/lib/active_record/validations.rb, line 327 327: def validate(*methods, &block) 328: methods << block if block_given? 329: write_inheritable_set(:validate, methods) 330: end

there is an example:   class Comment < ActiveRecord::Base     validate do |comment|       comment.must_be_friends     end

    def must_be_friends       errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)     end   end Understand how this matter？

2

    # File activerecord/lib/active_record/validations.rb, line 327 327: def validate(*methods, &block) 328: methods << block if block_given? 329: write_inheritable_set(:validate, methods) 330: end

On an array << is just append. Why do you ask ?

Fred