Titlebook: Ruby Quick Syntax Reference; Matt Clements Book 2014 Matt Clements 2014

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Numbers,The Numeric class within Ruby is a containing class for the Integer and Float classes. This contains all methods linked to numeric variables either with (float) or without (integer) decimal places. The Numeric class is a very simple class, which holds the ability to perform a number of complex calculations with numbers.

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Blocks, Procs, and Lambdas,Some of the most powerful features of the Ruby language are closures, which are known as blocks, procs, and lambdas within Ruby. Closures within Ruby are also often misunderstood, mainly due to the flexibility when using them within Ruby.

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Files and Directories,Continuing from the previous chapter, here we look at Ruby’s ability to deal with files and directories. Within a Ruby application, we may need to open files, amend those files, and write them back to a particular directory, or we may need to open a file, process this file, and move the file into another directory.

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Objects,ype we will look at is the Object data type. The Object data type (also known as BasicObject) mixes with the Kernel module to import a number of useful methods, which can be utilized for variousscenarios within Ruby programming.

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Functions and Methods,ter we begin to look at "reusable code," the ability to write a snippet of code that can be used multiple times during our application. This is sometimes known as the D.R.Y. (Don‘t Repeat Yourself) principle.

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Errors and Exceptions, exceptions within our code. Some of these errors and exceptions we will want to generate ourselves, such as when we have detected some abnormal behavior within the system, whereas other errors and exceptions will be thrown from the Ruby language itself, or other third-party libraries.

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