Ralph Johnson Books

Design Patterns: Elements of Reusable Object-Oriented Software
Design Patterns: Elements of Reusable Object-Oriented Software

By John Vlissides, Richard Helm, Erich Gamma, Ralph Johnson

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Four software designers present a catalog of simple and succinct solutions to commonly occurring design problems, using Smalltalk and C++ in example code. These 23 patterns allow designers to creat...

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A Peruvian Adventure
A Peruvian Adventure

By Ralph Johnson

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A Lost Age
A Lost Age

By Ralph Johnson

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The Lady s Secret
The Lady s Secret

By Ralph Johnson

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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