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Comprehensive Ruby Programming

You're reading from   Comprehensive Ruby Programming From beginner to confident programmer

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781787280649
Length 330 pages
Edition 1st Edition
Languages
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Author (1):
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Jordan Hudgens Jordan Hudgens
Author Profile Icon Jordan Hudgens
Jordan Hudgens
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Table of Contents (20) Chapters Close

Preface 1. Introduction to the Ruby Programming Language FREE CHAPTER 2. Ruby Variables 3. Ruby Strings 4. Working with Numbers in Ruby 5. Ruby Methods 6. Ruby Iterators and Loops 7. Ruby Collections 8. Ruby Conditionals 9. Object-Oriented Programming in Ruby 10. Working with the Filesystem in Ruby 11. Error Handling in Ruby 12. Regular Expressions in Ruby 13. Searching with grep in Ruby 14. Ruby Gems 15. Ruby Metaprogramming 16. Ruby Web Frameworks 17. Working with APIs in Ruby 18. Ruby Algorithms 19. Machine Learning

The for...in loops tutorial

If you're coming from other programming languages, you may already be familiar with the for loops. Ruby also has these types of loops; however, they are not used frequently in real-world applications. This is mainly because the each loop is more popular and easier to work with.

With that being said, it's still good to learn about the for loops to know all your available options provided in the language. Also, in this lesson, I'm going to show you an easy way to create an array of integers.

The syntax for a for...in loop is:

for i in 0...42 
p i
end

If you run this program, your output should look like this:

In the code, i is our iterator variable, and its value starts at 0. The 0...42 collection is a shortened way of creating an array of integers, and essentially, we are asking the i variable to iterate through this collection and...

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