run-ruby

Run Ruby

Introduction

On a daily basis you will most likely use your IDE to run code for you. Before we get to that however it's important to know how to run your own code manually.

Objectives

• Discover the ruby command
• Discover the irb command

Exercise

Use the ruby command

Run: ruby -h to find out the different options that the ruby command supports.

• Run the runme.rb file
• Run the same file use the option specifying the option that allows you to change the current directory
• Work out how to run the following line of ruby without putting it into a file: puts "Hello world"

Use the irb (interactive Ruby) command

IRB lets you run any commands you would run within your code in an interactive shell. This is very useful when you are trying to prototype something in particular.

Use irb to run some of the statements in runme.rb:

• What sort of object do you get when you run Time.now. (Use the .class method to find out)
• What other methods does that returned object have on it? (use the .public_methods method to find out, e.g. Time.now.public_methods)
• Use the Time RDoc to find out what extras you get