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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".
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
In C, two null pointers of any type are guaranteed to compare equal. [3] Prior to C23, the preprocessor macro NULL was provided, defined as an implementation-defined null pointer constant in <stdlib.h>, [4] which in C99 can be portably expressed as ((void *)0), the integer value 0 converted to the type void* (see pointer to void type). [5]
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A metasyntactic variable is a specific word or set of words identified as a placeholder in computer science and specifically computer programming.These words are commonly found in source code and are intended to be modified or substituted before real-world usage.
Object–relational mapping (ORM, O/RM, and O/R mapping tool) in computer science is a programming technique for converting data between a relational database and the memory (usually the heap) of an object-oriented programming language.
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In Haskell, the bottom type is called Void. [3] In Common Lisp the type NIL, contains no values and is a subtype of every type. [4] The type named NIL is sometimes confused with the type named NULL, which has one value, namely the symbol NIL itself. In Scala, the bottom type is denoted as Nothing.