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In software engineering, a software design pattern is a general, reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code. Rather, it is a description or template for how to solve a problem that can be used in many different situations. Design 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 mutable state may be unsuited for functional programming languages. Some patterns can be rendered unnecessary in languages that have built-in support for solving the problem they are trying to solve, and object-oriented patterns are not necessarily suitable for non-object-oriented languages.

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Design patterns gained popularity in computer science after the book Design Patterns: Elements of Reusable Object-Oriented Software was published in 1994 by the so-called "Gang of Four" (Gamma et al.), which is frequently abbreviated as "GoF". That same year, the first Pattern Languages of Programming Conference was held, and the following year the Portland Pattern Repository was set up for documentation of design patterns. The scope of the term remains a matter of dispute. Notable books in the design pattern genre include:

Design patterns can speed up the development process by providing tested, proven development paradigms.[4] Effective software design requires considering issues that may not become visible until later in the implementation. Freshly written code can often have hidden subtle issues that take time to be detected, issues that sometimes can cause major problems down the road. Reusing design patterns helps to prevent such subtle issues,[5] and it also improves code readability for coders and architects who are familiar with the patterns.

By definition, a pattern must be programmed anew into each application that uses it. Since some authors see this as a step backward from software reuse as provided by components, researchers have worked to turn patterns into components. Meyer and Arnout were able to provide full or partial componentization of two-thirds of the patterns they attempted.[6]

Software design techniques are difficult to apply to a broader range of problems.[citation needed] Design patterns provide general solutions, documented in a format that does not require specifics tied to a particular problem.

Design patterns are composed of several sections (see Documentation below). Of particular interest are the Structure, Participants, and Collaboration sections. These sections describe a design motif: a prototypical micro-architecture that developers copy and adapt to their particular designs to solve the recurrent problem described by the design pattern. A micro-architecture is a set of program constituents (e.g., classes, methods...) and their relationships. Developers use the design pattern by introducing in their designs this prototypical micro-architecture, which means that micro-architectures in their designs will have structure and organization similar to the chosen design motif.

Efforts have also been made to codify design patterns in particular domains, including use of existing design patterns as well as domain-specific design patterns. Examples include user interface design patterns,[7] information visualization,[8] secure design,[9] "secure usability",[10] Web design [11] and business model design.[12]

Design patterns had originally been categorized into 3 sub-classifications based on what kind of problem they solve. Creational patterns provide the capability to create objects based on a required criterion and in a controlled way. Structural patterns are about organizing different classes and objects to form larger structures and provide new functionality. Finally, behavioral patterns are about identifying common communication patterns between objects and realizing these patterns.

The documentation for a design pattern describes the context in which the pattern is used, the forces within the context that the pattern seeks to resolve, and the suggested solution.[27] There is no single, standard format for documenting design patterns. Rather, a variety of different formats have been used by different pattern authors. However, according to Martin Fowler, certain pattern forms have become more well-known than others, and consequently become common starting points for new pattern-writing efforts.[28] One example of a commonly used documentation format is the one used by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides in their book Design Patterns. It contains the following sections:

It has been observed that design patterns may just be a sign that some features are missing in a given programming language (Java or C++ for instance). Peter Norvig demonstrates that 16 out of the 23 patterns in the Design Patterns book (which is primarily focused on C++) are simplified or eliminated (via direct language support) in Lisp or Dylan.[29] Related observations were made by Hannemann and Kiczales who implemented several of the 23 design patterns using an aspect-oriented programming language (AspectJ) and showed that code-level dependencies were removed from the implementations of 17 of the 23 design patterns and that aspect-oriented programming could simplify the implementations of design patterns.[30]See also Paul Graham's essay "Revenge of the Nerds".[31]

Since I started my art licensing career, I am always looking for better ways to make my design process smooth and easy to follow. Because to be honest I am not fast at drawing and creating my motifs can take a lot of time. I wanted to develop my design ideas more quickly, so I tried different drawing and design techniques to create my motifs and then my patterns. So far Procreate has been my number one choice to sketch and draw my motifs and illustrations. Even if I am planning on creating a vectorized collection that will be finished in Adobe Illustrator later, Procreate is my best friend for creating my artwork.

In the past, I used to draw my motifs in Procreate and take them to Adobe Illustrator or Adobe Photoshop to finish my pattern. But since I discovered that in fact, I can totally create patterns in Procreate, I have been planning my collections within the App.

Yes, I do know Procreate has its pros and cons. For me, one of the cons is that the motifs can get pixelated if you move them around the canvas, and (in my case) I move them a lot when I am planning my designs. So I found that for planning my collections for my portfolio, creating patterns in Procreate is a great idea because it is fun, simple, and quick.

With my lined sketches (and without colors) I create my designs using the two different structures I mentioned so I can see which position of the motifs works better. This way I can create the repeated square of each design so when I work on the idea in Adobe Illustrator or Adobe Photoshop, I can know exactly where to place the motifs within my final pattern.

When I finish playing around with the placement of my sketches, I then decide which I will like to have as my final design. I continue coloring and finishing my drawings in case I want to work the pattern in Procreate or take them to Adobe Photoshop.

I live in the middle of the Caribbean where the sun is bright, the food is savory and the music is joyful. My designs are bright and bold, always a reflection of my happy soul. I like to think we can design the future we want to live in and paint a better world filled with bright colors.

The truth is, there ARE some standard numbers for selling art. Design studios provide a ton of artwork to companies, and they sell their patterns and illustrations at relatively standard prices, which can range from $450-$1,200 depending on industry. If you really want to zero in on numbers, I might tell you to sell a design for $600 for apparel, $700 for stationery, $800 for home decor.

Design patterns can speed up the development process by providing tested, proven development paradigms. Effective software design requires considering issues that may not become visible until later in the implementation. Reusing design patterns helps to prevent subtle issues that can cause major problems and improves code readability for coders and architects familiar with the patterns.

Often, people only understand how to apply certain software design techniques to certain problems. These techniques are difficult to apply to a broader range of problems. Design patterns provide general solutions, documented in a format that doesn't require specifics tied to a particular problem.

In addition, patterns allow developers to communicate using well-known, well understood names for software interactions. Common design patterns can be improved over time, making them more robust than ad-hoc designs.

These design patterns are all about class instantiation. This pattern can be further divided into class-creation patterns and object-creational patterns. While class-creation patterns use inheritance effectively in the instantiation process, object-creation patterns use delegation effectively to get the job done.

These design patterns are all about Class and Object composition. Structural class-creation patterns use inheritance to compose interfaces. Structural object-patterns define ways to compose objects to obtain new functionality.

The need for patterns results from using computer languages or techniques with insufficient abstraction ability. Under ideal factoring, a concept should not be copied, but merely referenced. But if something is referenced instead of copied, then there is no "pattern" to label and catalog. Paul Graham writes in the essay Revenge of the Nerds. 006ab0faaa