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Binary operator in computer programming
The null coalescing operator is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, such
Null_coalescing_operator
Binary operator in computer programming
similar operator is the null coalescing operator, where the boolean truth(iness) check is replaced with a check for non-null instead. This is usually
Elvis_operator
Boolean operator
navigation operator (also known as optional chaining operator, safe call operator, null-conditional operator, null-propagation operator) is a binary operator that
Safe_navigation_operator
Version of the C# programming language
Visual Studio 2005). The ?? operator is called the null coalescing operator and is used to define a default value for nullable value types as well as reference
C_Sharp_2.0
Set of rules defining correctly structured programs
Equivalent to */ $c = $a ? $a : $b; Since version 7.0, PHP supports the null coalescing operator (??).[citation needed] $a = $b ?? $c; /* Equivalent to */ $a =
PHP_syntax_and_semantics
Topics referred to by the same term
SQL function that selects the first non-null from a range of values Null coalescing operator, a binary operator that is part of the syntax for a basic
Coalescence
Topics referred to by the same term
regular expression, in ed-style syntax The logical defined-or (null coalescing) operator in Perl The prefix for the authority component of a Uniform Resource
//
Set of rules defining correctly structured programs for the C# programming language
returned. C# 8.0 introduces null-coalescing assignment, such that variable ??= otherwiseValue; is equivalent to if (variable is null) variable = otherwiseValue;
C_Sharp_syntax
Object with no referenced value or with defined neutral ("null") behavior
for null values, thereby freeing code that uses them from ever having to do so. Note that the example below uses the C# Null coalescing operator to guarantee
Null_object_pattern
General-purpose programming language
non-null foo()?.bar()?.baz() ?: (the null coalescing operator) is a binary operator that returns the first operand, if non-null, else the second operand. It is
Kotlin
Feature of some programming languages
the nil value and NilClass type. Null coalescing operator Semipredicate problem Union type Unit type "Nullable Types (C#)". Msdn.microsoft.com. Retrieved
Nullable_type
Typographic character indicating a question (?)
null coalescing operator. In Java, ? can represent a wildcard type parameter. For instance, List<?> denotes a list that can hold any type (but not null),
Question_mark
Topics referred to by the same term
A symbol indicating a blunder in chess annotation symbols The null coalescing operator, in some programming languages Question mark (disambiguation) This
??
Conditional operator in computer programming
digital input signals Null coalescing operator – Binary operator in computer programming Safe navigation operator – Boolean operator Three-way comparison
Ternary_conditional_operator
Topics referred to by the same term
trigraph which represents the number sign in C and C++ The null coalescing assignment operator, in some programming languages Search for "??=" on Wikipedia
??=
Joining of strings in a programming language
in Scheme, for two arguments only: (define append (lambda (ls1 ls2) (if (null? ls1) ls2 (cons (car ls1) (append (cdr ls1) ls2))))) Append can also be implemented
Concatenation
Marker used in SQL databases to indicate a value does not exist
is Null. The following example demonstrates the Null result returned by using Null with the SQL || string concatenation operator. 'Fish ' || NULL || 'Chips'
Null_(SQL)
Topics referred to by the same term
value is considered true, and its right operand if not Null coalescing operator, an operator in computer programming Onion routing, anonymous networking
Or
Programming language construct
virtual machine (VM) as of 2012. Don't-care term Null coalescing operator Ternary conditional operator Edsger W. Dijkstra "On a somewhat disappointing
Short-circuit_evaluation
Scripting language created in 1994
more flexible Heredoc and Nowdoc syntax in 7.3; and the null-coalescing assignment operator in 7.4. PHP 8.0 was released on 26 November 2020, as a major
PHP
Special function called to create an object
0 (integer types), 0.0 (floating-point types), false (boolean type), or null (reference types), etc. class Point { private: int x; int y; public: Point(int
Constructor (object-oriented programming)
Constructor_(object-oriented_programming)
Set of rules defining correctly structured programs
the value of b is not null or undefined, otherwise it will be assigned 3. const a = b ?? 3; Before the nullish coalescing operator, programmers would use
JavaScript_syntax
Comparison of C and C++ languages
length arrays. This feature leads to possibly non-compile time sizeof operator. void foo(size_t x, int a[*]); // VLA declaration void foo(size_t x, int
Compatibility_of_C_and_C++
setPrototypeOf(myObject, null); As of ECMAScript 5 (ES5), the prototype can also be bypassed by using Object.create(null): const myObject = Object.create(null); Object
Comparison of programming languages (associative array)
Comparison_of_programming_languages_(associative_array)
Comparison of two programming languages
string literals are null-terminated; that is to say, a trailing null character as an end-of-string sentinel: // the string s is null-terminated const char*
Comparison_of_Pascal_and_C
Object-oriented constructors Operators Ternary conditional operator Null coalescing operators Safe navigation operators Modulo operators Evaluation strategy List
Comparison of programming languages (list comprehension)
Comparison_of_programming_languages_(list_comprehension)
compound operators so that longer lines like: variable = variable + 1 can now be written as: variable += 1 However, increment and decrement operators are not
Comparison of Visual Basic and Visual Basic .NET
Comparison_of_Visual_Basic_and_Visual_Basic_.NET
Comparison between two programming languages
lang.OutOfMemoryError, but this rarely happens. The solution to this is to null out object references. A second common reason for memory leak is the use
Comparison_of_Java_and_C++
languages. Different languages use different symbols for the concatenation operator. Many languages use the "+" symbol, though several deviate from this. AWK
Comparison of programming languages (strings)
Comparison_of_programming_languages_(strings)
Computer programming function
returns the Boolean value false (with . being the function composition operator). Below, you can see a view of each step of the filter process for a list
Filter (higher-order function)
Filter_(higher-order_function)
Computer programming function
maplist, mapping a function over successive rest lists: maplist[x;f] = [null[x] -> NIL;T -> cons[f[x];maplist[cdr[x];f]]] The function maplist is still
Map_(higher-order_function)
Family of higher-order functions
elements with cons, as: map f = foldr ((:) . f) [] where the period (.) is an operator denoting function composition. This way of looking at things provides a
Fold_(higher-order_function)
Object-oriented constructors Operators Ternary conditional operator Null coalescing operators Safe navigation operators Modulo operators Evaluation strategy List
Comparison of programming languages (algebraic data type)
Comparison_of_programming_languages_(algebraic_data_type)
Set of rules defining correctly structured programs
working from left to right, or NULL if all the operands equal NULL. COALESCE(x1,x2) is equivalent to: CASE WHEN x1 IS NOT NULL THEN x1 ELSE x2 END The NULLIF
SQL_syntax
Versions of a JavaScript standard
the ** operator instead of Math.pow. The nullish coalescing operator, ??, returns its right-hand side operand when its left-hand side is null or undefined
ECMAScript_version_history
5 ** * math-like notation TUTOR (2 + 3)(45) $$ note implicit multiply operator A language that supports the statement construct typically has rules for
Comparison of programming languages (syntax)
Comparison_of_programming_languages_(syntax)
Object-oriented constructors Operators Ternary conditional operator Null coalescing operators Safe navigation operators Modulo operators Evaluation strategy List
Comparison of programming languages by type system
Comparison_of_programming_languages_by_type_system
overloading of operators, it can define operators PHP does not support operator overloading natively, but support can be added using the "operator" PECL package
Comparison of programming languages (object-oriented programming)
Comparison_of_programming_languages_(object-oriented_programming)
Programming language
Standard Pascal. Standard Pascal has a Euclidean-like definition of the mod operator whereas Delphi uses a truncated definition. Standard Pascal requires that
Comparison of Pascal and Delphi
Comparison_of_Pascal_and_Delphi
Object-oriented constructors Operators Ternary conditional operator Null coalescing operators Safe navigation operators Modulo operators Evaluation strategy List
Comparison of programming languages
Comparison_of_programming_languages
lifted*operator propagates the null value of the operand; in Java, unboxing the null reference throws an exception. Not all C# lifted operators have been
Comparison of C Sharp and Java
Comparison_of_C_Sharp_and_Java
Comparison of two programming languages
interface implementation Can use the coalesce operator ?? to return the first non-null value (ex. null ?? null ?? 1 returns 1). VB.NET would have to
Comparison of C Sharp and Visual Basic .NET
Comparison_of_C_Sharp_and_Visual_Basic_.NET
Design pattern in computer programming
Or alternatively, with the null-coalescing assignment operator ??= private int _myWidgetID; private Widget _myWidget = null; public Widget MyWidget { get
Lazy_loading
Object-oriented constructors Operators Ternary conditional operator Null coalescing operators Safe navigation operators Modulo operators Evaluation strategy List
Comparison of server-side web frameworks
Comparison_of_server-side_web_frameworks
List of programming language comparisons
user-defined function or a single primitive function by use of the Variant operator (⍠). Because C does not bound-check indices, a pointer to the interior
Comparison of programming languages (array)
Comparison_of_programming_languages_(array)
"abcdef" "abc" + "def" ' returns "abcdef" "abc" & Null ' returns "abc" "abc" + Null ' returns Null // Example in D "abc" ~ "def"; // returns "abcdef"
Comparison of programming languages (string functions)
Comparison_of_programming_languages_(string_functions)
SELECTED_INT_KIND intrinsic function. ^aIn most expressions (except the sizeof and & operators), values of array types in C are automatically converted to a pointer
Comparison of programming languages (basic instructions)
Comparison_of_programming_languages_(basic_instructions)
Open standard for programming heterogenous computing systems, such as CPUs or GPUs
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU, NULL, NULL, NULL); // create a command queue clGetDeviceIDs(NULL, CL_DEVICE_TYPE_DEFAULT, 1, devices, NULL); cl_command_queue
OpenCL
Programming language and superset of JavaScript
several features, including the ability for programmers to optionally enforce null safety. TypeScript 3.0 was released on 30 July 2018, bringing many language
TypeScript
Cross-platform shell based on .NET technology
operator for ternary operation The ?? operator for null coalescing The ??= operator for null coalescing assignment Cross-platform Invoke-DscResource (experimental)
PowerShell
which will by their very natures, not be null objects. To avoid this behaviour, one can use the IS operator to compare an object directly to Nothing,
Is_functions
Numeric value with an unclear meaning
better. In C and C++, 0 is often used to mean null pointer even though the C standard library defines a macro NULL and modern C++ includes a keyword nullptr
Magic_number_(programming)
Dynamic memory management in the C programming language
The C++ programming language includes these functions; however, the operators new and delete provide similar functionality and are recommended by that
C_dynamic_memory_allocation
Form of automatic memory management
decrease in the overhead on counter updates can be obtained by update coalescing introduced by Levanoni and Petrank. Consider a pointer that in a given
Garbage collection (computer science)
Garbage_collection_(computer_science)
Compact astronomical body
accretion disk followed by computer modelling. Gravitational waves from coalescing binary black holes can also provide the spin of both progenitor black
Black_hole
Theory of gravitation as curved spacetime
predictions follow from the fact that light follows what is called a light-like or null geodesic—a generalization of the straight lines along which light travels
General_relativity
Wi-Fi used for network connectivity
construction sites or research labs. Simplify networking technologies by coalescing around a small number of Internet related widely used technologies, limiting
Long-range_Wi-Fi
Function used in signal processing
templates and simulated signals in the detection of gravitational waves from coalescing compact binaries". Classical and Quantum Gravity. 27 (8) 084020. arXiv:1003
Window_function
Programming language
(leftmost) part can be combined into a "chained" statement using the chain operator :. The common part of the statements is written to the left of the colon
ABAP
Establishment that provides lodging paid on a short-term basis
resorts. Yurts are circular, self-supporting structures with long rafters coalescing toward a central dome. During the day, the dome allows sunlight to illuminate
Hotel
the original gaseous matter present in the Universe caused it to begin coalescing and forming stars and caused the stars to group together into galaxies
Glossary_of_engineering:_A–L
European Space Agency space mission
four Cluster satellites September 3 - Statistics and accuracy of magnetic null identification in multispacecraft data (open access) August 22 - Cusp dynamics
Cluster_II_(spacecraft)
Election of a new ombudsman of Bolivia
party's preferred candidate. Neither, however, would CC opt for the blank or null vote, "because it would be a vote in favor of Nadia Cruz; there must be a
2022 Bolivian ombudsman election
2022_Bolivian_ombudsman_election
NULL COALESCING-OPERATOR
NULL COALESCING-OPERATOR
Girl/Female
American, Australian, British, Danish, English, French, German, Greek, Irish, Swedish
Shining Light; Light; The Light of the Sun from Eleanor and Variation of Helen; Sun Ray; Stone; Champion; Horn; Torch; Moon; Moon Elope
Surname or Lastname
Dutch and German
Dutch and German : from the personal name Nel, a reduced form of Cornelius.South German : nickname from Middle High German nelle ‘crown of the head’, perhaps denoting an obstinate person.English : from the Middle English personal name Nel(le), a variant of Neill.
Male
English
Medieval pet form of English Oliver, probably NOLL means "elf army."
Girl/Female
Arabic
Arabian Jasmine
Boy/Male
British, English
Grinder
Boy/Male
Celtic
Champion.
Girl/Female
Afghan, Australian, Danish, Swedish
God
Surname or Lastname
English
English : from an Old English personal name, Lulla.German (Lüll) : from a short form of any of the Germanic personal names formed with liut- ‘people’ as the first element.Catalan (also Llull) : from the personal name Lullus, probably of Germanic origin.
Surname or Lastname
English
English : nickname for a strong, aggressive, bull-like man, from Middle English bul(l)e, bol(l)e. Occasionally, the name may denote a keeper of a bull. Compare Bulman.German (mainly northern) : from a byname for a cattle breeder, keeper, or dealer. Compare South German Ochs.South German : nickname for a short fat man, a variant of Bolle, or a nickname for a man with the physical characteristics of a bull.
Surname or Lastname
English
English : from the Old English personal name Cula.Americanized spelling of German and Swedish Kall or German Koll.
Surname or Lastname
English
English : variant of Hill 1.English : from a pet form of Hugh.
Surname or Lastname
English
English : unexplained.Possibly a shortened form of any of several German compound surnames formed with Full- or Füll-.
Surname or Lastname
English
English : of uncertain origin, possibly from an unrecorded late survival of the Old English personal name Tula.South German (Tüll) : from a nickname for someone who was patient, from Middle High German dult ‘patience’; or from a personal name formed with the same word; or from Middle High German tult, dult ‘fair’, ‘festival’ (Bavarian Dult).South German : nickname for a stubborn man, Tull.Altered spelling of German Toll.
Female
English
Pet form of English Eleanor, NELL means "foreign; the other."
Surname or Lastname
English
English : nickname from Middle English gulle ‘gull’ or gul(le) (Old Norse gulr) ‘yellow’, ‘pale’ (of hair or complexion).Swiss German : nickname for an irascible or unreliable person, from an Alemannic form of Latin gallus ‘rooster’. See also Guell.
Boy/Male
Shakespearean
Love's Labours Lost' A constable.
Girl/Female
Greek American English French
Shining light. The bright one.
Male
Hungarian
Hungarian form of Greek Emmanouel, EMÃNUEL means "God is with us."
Boy/Male
Hindu
Battle maiden
Boy/Male
British, English, Spanish
Strong Leader; Empty
NULL COALESCING-OPERATOR
NULL COALESCING-OPERATOR
Girl/Female
Australian, Gujarati, Hindu, Indian, Tamil
Melodious; Music Melodies; Music Name
Girl/Female
Australian, Celtic, Hebrew, Irish, Latin
Musical; Blind
Surname or Lastname
French
French : from the personal name Servais, Latin Servatius (see Servatius).English : variant of Service.
Male
English
Variant spelling of English Delaiah, DELAIA means "God has drawn."
Boy/Male
Indian, Sanskrit
Merciful as the Light of the Moon
Female
Portuguese
Galician-Portuguese form of French Blanche, BRANCA means "white."
Girl/Female
Indian
A Flower; Joy Full
Male
Finnish
Pet form of Finnish Aapeli, AAPO means "vanity," i.e. "transitory."
Boy/Male
Dutch Swedish American Latin English
Laurel.
Boy/Male
Arabic, Hindu, Indian, Muslim
Grocer
NULL COALESCING-OPERATOR
NULL COALESCING-OPERATOR
NULL COALESCING-OPERATOR
NULL COALESCING-OPERATOR
NULL COALESCING-OPERATOR
v. t.
To strip off or separate the hull or hulls of; to free from integument; as, to hull corn.
v. i.
To become dull or stupid.
superl.
Furnishing little delight, spirit, or variety; uninteresting; tedious; cheerless; gloomy; melancholy; depressing; as, a dull story or sermon; a dull occupation or period; hence, cloudy; overcast; as, a dull day.
p. pr. & vb. n.
of Coalesce
a.
Full to the brim; quite full; chock-full.
a.
Of or pertaining to a bull; resembling a bull; male; large; fierce.
a.
Quite full; choke-full.
n.
A contest; a struggle; as, a wrestling pull.
v. t.
To gather with the hand, or by drawing toward one; to pluck; as, to pull fruit; to pull flax; to pull a finch.
v. t.
To move or operate by the motion of drawing towards one; as, to pull a bell; to pull an oar.
n.
A knob, handle, or lever, etc., by which anything is pulled; as, a drawer pull; a bell pull.
a.
Separate; not coalescent; -- said of things usually coalescent.
Compar.
Not wanting in any essential quality; complete, entire; perfect; adequate; as, a full narrative; a person of full age; a full stop; a full face; the full moon.
Compar.
Abundantly furnished or provided; sufficient in. quantity, quality, or degree; copious; plenteous; ample; adequate; as, a full meal; a full supply; a full voice; a full compensation; a house full of furniture.
a.
No; not any; as, nul disseizin; nul tort.
n.
The state of not coalescing.
n.
A cully; a dupe; a gull. See Cully.
v. t.
To dispirit or deaden; to dull or blunt.
n.
A promontory; as, the Mull of Cantyre.
v. t.
To endeavor to raise the market price of; as, to bull railroad bonds; to bull stocks; to bull Lake Shore; to endeavor to raise prices in; as, to bull the market. See 1st Bull, n., 4.