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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 2. Ruby Variables FREE CHAPTER 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

String substitution guide

In this section, we'll walk through a practical string method that enables you to substitute string values that I use in many real-world applications:

str = "The quick brown fox jumped over the quick dog" 

If you notice, I've modified this sentence a bit to have the quick word appear twice in my sentence.

Now, if I want to substitute it with the slow word, I can use the sub method (which is short for substitution):

str = "The quick brown fox jumped over the quick dog" 
str.sub "quick", "slow"

In the preceding code, I'm calling the sub method on my str string variable and passing two arguments to the sub method:

  • The first is the word the program has to find
  • The second is the replacement word

If I run this code, my output will be "The slow brown fox jumped over the quick dog":

If you notice...

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