Exercise 13. Parameters, Unpacking, Variables


In this exercise we will cover one more input method you can use to pass variables to a script (script being another name for your .rb files). You know how you type ruby ex13.rb to run the ex13.rb file? Well, the ex13.rb part of the command is called an “argument.” What we’ll do now is write a script that also accepts arguments.

Type this program, and I’ll explain it in detail:


 1    first, second, third = ARGV  2  3    puts "Your first variable is: #{first}"  4    puts "Your second variable is: #{second}"  5    puts "Your third variable is: #{third}"

ARGV is ...

Get Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition, Video Enhanced Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.