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Mastering Chef

You're reading from   Mastering Chef Build, deploy, and manage your IT infrastructure to deliver a successful automated system with Chef in any environment

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781783981564
Length 374 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Mayank Joshi Mayank Joshi
Author Profile Icon Mayank Joshi
Mayank Joshi
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Toc

Table of Contents (15) Chapters Close

Preface 1. Introduction to the Chef Ecosystem FREE CHAPTER 2. Knife and Its Associated Plugins 3. Chef and Ruby 4. Controlling Access to Resources 5. Starting the Journey to the World of Recipes 6. Cookbooks and LWRPs 7. Roles and Environments 8. Attributes and Their Uses 9. Ohai and Its Plugin Ecosystem 10. Data Bags and Templates 11. Chef API and Search 12. Extending Chef 13. (Ab)Using Chef Index

Methods


Ruby methods are what we refer to as functions in some other programming languages. Many a times, we would want all the statements, operators, and so on that we saw earlier, to be bundled together and used as a single unit. Methods are means to accomplish this feat.

In Ruby, a method name should begin with a lowercase letter. Methods should be defined before they are called upon, otherwise an exception is raised by Ruby.

The syntax to define a method is as follows:

def method_name [([arg [= default]]...[, *arg [, &expr ]])]
end

Let's look at a few different examples to make this syntax more clear.

Example 1—a simple method:

def method
  # Method definition goes here
end

Example 2—a method with two arguments:

def method (arg1, arg2)
   #  Method definition goes here
end

Example 3—a method with two arguments having some default values. This will pass default values to the arguments if the method is called without passing the required parameters:

def method (arg1=val1, arg2=val2)   #  Method...
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