What are patterns in computer?

In software development, a pattern (or design pattern) is a written document that describes a general solution to a design problem that recurs repeatedly in many projects. Often, programmers can use more than one pattern to address a specific problem. A collection of patterns is called a pattern framework.

What are the types of behavioral patterns?

There are 12 types of behavioral design patterns:

• Chain of Responsibility Pattern.
• Command Pattern.
• Interpreter Pattern.
• Iterator Pattern.
• Mediator Pattern.
• Memento Pattern.
• Observer Pattern.
• State Pattern.

How are design patterns used in Computer Science?

Design pattern (computer science) are extensively used by software engineers for the actual design process as well as for communicating a design to others. Software patterns first became popular with the object-oriented Design Patterns: Elements of Reusable Object-Oriented Software book.

How are command patterns used in object oriented programming?

In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or trigger an event at a later time. This information includes the method name, the object that owns the method and values for the method parameters.

How does the execution of patterns work in AWK?

Patterns in awk control the execution of rules: a rule is executed when its pattern matches the current input record. This section explains all about how to write patterns.

How are pattern collections related to interaction design?

These patterns share a lot of similarities and basically all provide solutions to usability problems in interaction and interface design. Some patterns are known under different names (or even the same name) in different pattern collections. Patterns originated as an architectural concept by Christopher Alexander (1977).