What is <<- in ruby?

Question

From the Ruby_Newbie Guide to Symbols:

Author is trying to show a simplified implementation of the attr_writer method.

#!/usr/bin/env ruby

def make_me_a         


        

Answer 1

It's a heredoc. From the "Here Documents" documentation:

If you are writing a large block of text you may use a “here document” or “heredoc”:

expected_result = <

The heredoc starts on the line following < and ends with the next line that starts with HEREDOC. The result includes the ending newline.