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Procedures

This chapter

  • Introduces procedures as a way to avoid having to type things all the time ('how do we make our program greet us?')
  • Introduces the idea of a code file as 'stored procedures'
  • Introduces the difference between defining a procedure and calling it (by defining a greet function in a file required by irb with irb -r greet.rb and then immediately invoking it, first in the REPL then in the file)
  • Introduces the idea of MVP steps
  • Introduces the idea of 'global scope' by how the procedure is defined on the Universe (main function) itself