Ruby Introduction

Goals

Use the repl.it interface comfortably
Identify different between puts and print
Explore, then explain what String methods can help us do

Review what we know, puts vs. print

Using the repl.it we just forked, complete the activity that follows:

Try It: Exploring puts vs. print

Read the Ruby code in the repl.it and predict what will happen when it is run. With the concepts and vocabulary you learned in the prework, try to explain why! Be ready to share out.

Now, run the repl.it.

Last, change both instances of puts to print. Observe the change in output. What does that tell you about the job that each command has?

Takeaways

String Methods

In the spirit of exploring to learn, we aren’t gong to tell what what exactly the code below does - not yet.

first_name = "osCAr"
puts "Hello, #{first_name}!"
puts "Hello, #{first_name.capitalize}!"

Try It: Exploring Methods

Read the code above and predict what will happen when it is run. Try to explain why.

Now, type or copy and paste the code into your repl.it and run it - does that verify or falsify your prediction?

Then, change capitalize to upcase, then downcase, then reverse. Re-run the code each time to change it, and observe the output.

Takeaways

Next: User Input