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The null coalescing operator is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, such as (in alphabetical order): C# [1] since version 2.0, [2] Dart [3] since version 1.12.0, [4] PHP since version 7.0.0, [5] Perl since version 5.10 as logical defined-or, [6] PowerShell since 7.0.0, [7] and Swift [8] as nil-coalescing operator.
Server side validation, Client Side Validation (JQuery) Apache Sling: Java Yes Yes Push-pull Uses JCR content repository Yes Yes Yes Apache Struts: Java Yes Yes Push-pull Yes Yes Unit tests: Yes Yes Apache Tapestry: Java Prototype, jQuery Yes Pull Yes JPA, Hibernate, Cayenne: Selenium, TestNG, JUnit: Spring Security, Shiro Yes with extensions
Null coalescing operators; ... Comparison of C# and Visual Basic .NET; Comparison of Visual Basic and Visual Basic .NET; ... JavaScript: semicolon separated (but ...
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.
Ternary conditional operator; Null coalescing operators; ... Comparison of C# and Visual Basic .NET; ... JavaScript: Client-side, server-side, web
JavaScript's nearest operator is ??, the "nullish coalescing operator", which was added to the standard in ECMAScript's 11th edition. [14] In earlier versions, it could be used via a Babel plugin, and in TypeScript.
Ternary conditional operator; Null coalescing operators; ... Comparison of C# and Visual Basic .NET; ... JavaScript: 0 no no checked ...
(* Alternatively one can use the datavtype keyword *) dataviewtype int_or_string_vt (bool) = | String_vt (true) of string | Int_vt (false) of int (* Alternatively one ...