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  2. Comparison of programming languages (associative array)

    en.wikipedia.org/wiki/Comparison_of_programming...

    the Add method, which adds a key and value and throws an exception if the key already exists in the dictionary; assigning to the indexer, which overwrites any existing value, if present; and; assigning to the backing property of the indexer, for which the indexer is syntactic sugar (not applicable to C#, see F# or VB.NET examples).

  3. Code refactoring - Wikipedia

    en.wikipedia.org/wiki/Code_refactoring

    Here is a list of a few of these editors, or so-called refactoring browsers. DMS Software Reengineering Toolkit (Implements large-scale refactoring for C, C++, C#, COBOL, Java, PHP and other languages) Eclipse based: Eclipse (for Java, and to a lesser extent, C++, PHP, Ruby and JavaScript) PyDev (for Python) Embarcadero Delphi; IntelliJ based:

  4. Method overriding - Wikipedia

    en.wikipedia.org/wiki/Method_overriding

    The overridden base method must be virtual, abstract, or override. In addition to the modifiers that are used for method overriding, C# allows the hiding of an inherited property or method. This is done using the same signature of a property or method but adding the modifier new in front of it. [6] In the above example, hiding causes the following:

  5. Self-modifying code - Wikipedia

    en.wikipedia.org/wiki/Self-modifying_code

    overlay of existing instructions (or parts of instructions such as opcode, register, flags or addresses) or direct creation of whole instructions or sequences of instructions in memory creating or modification of source code statements followed by a 'mini compile' or a dynamic interpretation (see eval statement)

  6. Hash table - Wikipedia

    en.wikipedia.org/wiki/Hash_table

    Hashing is an example of a space-time tradeoff. If memory is infinite, the entire key can be used directly as an index to locate its value with a single memory access. On the other hand, if infinite time is available, values can be stored without regard for their keys, and a binary search or linear search can be used to retrieve the element.

  7. Immutable object - Wikipedia

    en.wikipedia.org/wiki/Immutable_object

    By default, collection classes such as List and Map are immutable, so update-methods return a new instance rather than mutating an existing one. While this may sound inefficient, the implementation of these classes and their guarantees of immutability mean that the new instance can re-use existing nodes, which, especially in the case of ...

  8. Referential integrity - Wikipedia

    en.wikipedia.org/wiki/Referential_integrity

    An example of a database that has not enforced referential integrity. In this example, there is a foreign key (artist_id) value in the album table that references a non-existent artist — in other words there is a foreign key value with no corresponding primary key value in the referenced table.

  9. List of PHP extensions - Wikipedia

    en.wikipedia.org/wiki/List_of_PHP_extensions

    This is the present list of all officially documented extensions for the PHP programming language. Apache; ... List of PHP extensions. 2 languages ...