Download Design Patterns in Ruby (Addison-Wesley Professional Ruby by Russ Olsen PDF

By Russ Olsen

Praise for Design styles in Ruby

"Design styles in Ruby files shrewdpermanent how you can get to the bottom of many difficulties that Ruby builders as a rule stumble upon. Russ Olsen has performed an excellent task of choosing vintage styles and augmenting those with more recent styles that experience designated relevance for Ruby. He sincerely explains each one concept, creating a wealth of expertise on hand to Ruby builders for his or her personal day-by-day work."

—Steve Metsker, coping with advisor with Dominion electronic, Inc.

"This e-book presents an excellent demonstration of the major 'Gang of Four' layout styles with no resorting to overly technical motives. Written in an actual, but virtually casual variety, this publication covers adequate flooring that even these with out past publicity to layout styles will quickly consider convinced utilising them utilizing Ruby. Olsen has performed a good activity to make a e-book a few classically 'dry' topic into such an attractive or even sometimes funny read."

—Peter Cooper

"This booklet renewed my curiosity in knowing styles after a decade of fine intentions. Russ picked the main valuable styles for Ruby and brought them in a simple and logical demeanour, going past the GoF's styles. This ebook has better my use of Ruby, and inspired me to blow off the airborne dirt and dust overlaying the GoF book."

—Mike Stok

"Design styles in Ruby is a smart means for programmers from statically typed objectoriented languages to profit how layout styles seem in a extra dynamic, versatile language like Ruby."

—Rob Sanheim, Ruby Ninja, Relevance

Most layout trend books are in accordance with C++ and Java. yet Ruby is different—and the language's exact traits make layout styles more straightforward to enforce and use. during this publication, Russ Olsen demonstrates easy methods to mix Ruby's energy and magnificence with styles, and write extra subtle, powerful software program with a long way fewer traces of code.

After reviewing the background, strategies, and objectives of layout styles, Olsen bargains a short travel of the Ruby language—enough to permit any skilled software program developer to right away make the most of styles with Ruby. The publication specially calls cognizance to Ruby positive factors that simplify using styles, together with dynamic typing, code closures, and "mixins" for simpler code reuse.

Fourteen of the vintage "Gang of Four" styles are thought of from the Ruby perspective, explaining what difficulties every one development solves, discussing even if conventional implementations make experience within the Ruby atmosphere, and introducing Ruby-specific advancements. You'll notice possibilities to enforce styles in precisely one or strains of code, rather than the forever repeated boilerplate that traditional languages frequently require.

Design styles in Ruby additionally identifies leading edge new styles that experience emerged from the Ruby group. those contain how one can create customized items with metaprogramming, in addition to the formidable Rails-based "Convention Over Configuration" trend, designed to aid combine complete functions and frameworks.

Engaging, useful, and obtainable, Design styles in Ruby can help you construct larger software program whereas making your Ruby programming adventure extra rewarding.

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Extra resources for Design Patterns in Ruby (Addison-Wesley Professional Ruby Series)

Sample text

Ruby is a dynamically typed language, which means that variables have no fixed type. In Ruby, you simply pull a variable name out of thin air and assign a value to it. The variable will take on the type of the value it happens to hold. Not only that, but at different times in the same program a variable might hold radically different types. 14159; later in the same program, the value might be a reference to a complex mathematical algorithm; still later, it might be the string "apple". We will revisit dynamic typing a number of times in this book (starting with the very next chapter, if you can’t wait), but for now just remember that variables take on the types of their values.

There is nothing declaring that the variable first_name is, and always will be, a string. Ruby is a dynamically typed language, which means that variables have no fixed type. In Ruby, you simply pull a variable name out of thin air and assign a value to it. The variable will take on the type of the value it happens to hold. Not only that, but at different times in the same program a variable might hold radically different types. 14159; later in the same program, the value might be a reference to a complex mathematical algorithm; still later, it might be the string "apple".

First, they introduced most of the software engineering world to the idea of design patterns, where each pattern is a prepackaged solution to a common design problem. We should look around, they wrote, and identify common solutions to common problems. We should give each solution a name, and we should talk about what that solution is good for, when to use it, and when to reach for something else. And we should write all of this information down, so that over time our palette of design solutions will grow.

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