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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