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List comprehension is a syntactic construct available in some programming languages for creating a list based on existing lists. It follows the form of the mathematical set-builder notation (set comprehension) as distinct from the use of map and filter functions.
namespace DesignPatterns.LazyInitialization; public class LazyFactoryObject {// internal collection of items // IDictionary makes sure they are unique private IDictionary < LazyObjectSize, LazyObject > _LazyObjectList = new Dictionary < LazyObjectSize, LazyObject > (); // enum for passing name of size required // avoids passing strings and is ...
Doctrine, open source ORM for PHP, Free software (MIT) CakePHP, ORM and framework, open source (scalars, arrays, objects); based on database introspection, no class extending; CodeIgniter, framework that includes an ActiveRecord implementation; Yii, ORM and framework, released under the BSD license. Based on the ActiveRecord pattern
The Java standard library provides utility classes to use with enumerations. The EnumSet class implements a Set of enum values; it is implemented as a bit array, which makes it very compact and as efficient as explicit bit manipulation, but safer. The EnumMap class implements a Map of enum values to object. It is implemented as an array, with ...
In computer science, an enumeration algorithm is an algorithm that enumerates the answers to a computational problem. Formally, such an algorithm applies to problems that take an input and produce a list of solutions, similarly to function problems. For each input, the enumeration algorithm must produce the list of all solutions, without ...
Collection implementations in pre-JDK 1.2 versions of the Java platform included few data structure classes, but did not contain a collections framework. [4] The standard methods for grouping Java objects were via the array, the Vector, and the Hashtable classes, which unfortunately were not easy to extend, and did not implement a standard member interface.
JDO: Java Data Objects, persistence for Java objects; Torque: ORM for Java; DeltaSpike: collection of JSR-299 (CDI) Extensions for building applications on the Java SE and EE platforms; Apache Directory Committee Directory: LDAP and Kerberos, entirely in Java. Directory Server: an extensible, embeddable LDAP and Kerberos server, entirely in Java
Objects can contain other objects in their instance variables; this is known as object composition. For example, an object in the Employee class might contain (either directly or through a pointer) an object in the Address class, in addition to its own instance variables like "first_name" and "position".