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What is Design Patterns?

In software engineering, a design pattern is a general reusable solution to a commonly occurring problem within a given context in software design.

A design pattern is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations. Patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system. Object-oriented design patterns typically show relationships and interactions between classes or objects, without specifying the final application classes or objects that are involved. Patterns that imply object-orientation or more generally mutable state, are not as applicable in functional programming languages.

Design patterns reside in the domain of modules and interconnections. At a higher level there are architectural patterns that are larger in scope, usually describing an overall pattern followed by an entire system.

There are many types of design patterns, for instance

  • Algorithm strategy patterns addressing concerns related to high-level strategies describing how to exploit application characteristics on a computing platform.
  • Computational design patterns addressing concerns related to key computation identification.
  • Execution patterns that address concerns related to supporting application execution, including strategies in executing streams of tasks and building blocks to support task synchronization.
  • Implementation strategy patterns addressing concerns related to implementing source code to support program organization, and the common data structures specific to parallel programming.
  • Structural design patterns addressing concerns related to high-level structures of applications being developed.

Source - http://en.wikipedia.org/wiki/Software_design_pattern

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