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The Ruby Workshop

You're reading from   The Ruby Workshop Develop powerful applications by writing clean, expressive code with Ruby and Ruby on Rails

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Product type Paperback
Published in Oct 2019
Publisher Packt
ISBN-13 9781838642365
Length 544 pages
Edition 1st Edition
Languages
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Authors (4):
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Dániel Szabó Dániel Szabó
Author Profile Icon Dániel Szabó
Dániel Szabó
Akshat Paul Akshat Paul
Author Profile Icon Akshat Paul
Akshat Paul
Peter Philips Peter Philips
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Peter Philips
Cheyne Wallace Cheyne Wallace
Author Profile Icon Cheyne Wallace
Cheyne Wallace
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Toc

Table of Contents (14) Chapters Close

Preface 1. Writing and Running Ruby Programs 2. Ruby Data Types and Operations FREE CHAPTER 3. Program Flow Ruby Methods 5. Object-Oriented programming with Ruby 6. Modules and Mixins 7. Introduction to Ruby Gems 8. Debugging with Ruby 9. Ruby Beyond the Basics l 10. Ruby Beyond the Basics ll 11. Introduction to Ruby on Rails l 12. Introduction to Ruby on Rails ll Appendix

Loops

Loops are a type of program flow that repeat blocks of code. The ability to repeat a block of code allows us to do things such as processing collections of data. Typically, loops will run until a condition is satisfied. For instance, a loop may be run until it has run a certain number of times, or a loop may be run until it has processed all the items in a collection of data. Let's look at the following types of loops in Ruby:

  • while/do loops
  • until/do loops
  • do/while loops

The while/do Loop

Another foundational concept for program flow is being able to repeat sections of code until a condition is met. These are called loops and in Ruby there are many ways to create loops. The most basic structure of a loop contains two things:

  • The condition that will be evaluated to determine whether to repeat the code
  • The block of code to be repeated

Here is a simple block using the while keyword:

while true do
  puts Time.now
end...
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