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In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior.The null object design pattern, which describes the uses of such objects and their behavior (or lack thereof), was first published as "Void Value" [1] and later in the Pattern Languages of Program Design book series as "Null Object".
C# 6.0 and above have ?., the null-conditional member access operator (which is also called the Elvis operator by Microsoft and is not to be confused with the general usage of the term Elvis operator, whose equivalent in C# is ??, the null coalescing operator) and ?[], the null-conditional element access operator, which performs a null-safe call of an indexer get accessor.
Jakarta Annotations (CA; formerly Common Annotations for the Java Platform or JSR 250) is a part of Jakarta EE.Originally created with the objective to develop Java annotations (that is, information about a software program that is not part of the program itself) for common semantic concepts in the Java SE and Java EE platforms that apply across a variety of individual technologies.
In source code, the null character is often represented as the escape sequence \0 in string literals (for example, "abc\0def") or in character constants ('\0'); the latter may also be written instead simply as 0 (without quotes nor slash). [8]
Null functions have several uses. During software development, null functions with the same names and type signatures as a planned functions are often used as stubs—that is, as non-functional placeholders that allow the incomplete body of code to be compiled and tested prior to completion of all planned features.
An early attempt to guarantee void safety was the design of the Self programming language.. The Eiffel language is void-safe according to its ISO-ECMA standard; the void-safety mechanism is implemented in EiffelStudio starting with version 6.1 and using a modern syntax starting with version 6.4.
A symbol for the empty set. Common notations for the empty set include "{ }", "", and "∅".The latter two symbols were introduced by the Bourbaki group (specifically André Weil) in 1939, inspired by the letter Ø (U+00D8 Ø LATIN CAPITAL LETTER O WITH STROKE) in the Danish and Norwegian alphabets. [2]
Null symbol may refer to: . Null character, U+0000 <control-0000>, U+2400 ␀ SYMBOL FOR NULL (a single-character glyph "NUL"); Null sign (∅), the empty set; Null (SQL) (ω), a special marker and keyword NULL in SQL