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

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Input/Output,is worth noting that Input/Output is not just restricted to File processes, as often wrongly assumed. Ruby Input/Output is defined from the single base class IO. Derived from the IO class, we then have more specialized, but otherwise similar subclasses, such as . and . that deal with the Input/Outpu

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Metaprogramming,s on other data, such as the reading/writing of variables, outputting to screen, communicating with files or other input output streams. Metaprogramming is the ability to write code that adjusts the functionality of a class or dynamically call a method without a direct call to this method existing w

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Operators,Unlike other programming languages, in Ruby there isn’t a distinction between statements and expressions: everything is evaluated as an expression that produces a return value. The simplest expressions are:

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Strings,A string within Ruby is a sequence of one of more bytes, typically a set of characters. These can be created, manipulated, and output when required. Strings are generally wrapped in single or double quotation marks:

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Arrays,Ruby arrays are integer–indexed arrays starting at position 0, rather like Java or C. Negative values can be used to retrieve values from the array from the end, so ?1 would show the last element of an array, and ?2 would show the second from last element.

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