Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition

Exercise 8. Printing, Printing

I will now show you how to create a format string, but rather than using variables, we’ll use values by their names. Some of this is a bit more advanced, but don’t worry you’ll learn what all of these mean later. Just type this in, make it work, and write a comment above each line translating it to English.

ex8.rb

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 1    formatter = "%{first} %{second} %{third} %{fourth}"  2  3    puts formatter % {first: 1, second: 2, third: 3, fourth: 4}  4    puts formatter % {first: "one", second: "two", third: "three",  5                      fourth: "four"}  6    puts formatter % {first: true, second: false, third: true, fourth: false}  7    puts formatter % {first: formatter, second: formatter, ...