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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.
Null coalescing operators; Safe navigation operators; Modulo operators; Evaluation strategy; List of "Hello World" programs; Comparison of individual languages.
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.
Null coalescing operators; Safe navigation operators; Modulo operators; Evaluation strategy; List of "Hello World" programs; Comparison of individual languages.
Null coalescing operators; Safe navigation operators; Modulo operators; ... null, null) or PrintString(x) y.OnCopy(x) x.OnCompare(y) object handle can be converted ...
Meaning that if the content of variable ifNotNullValue is not null, that content will be returned, otherwise the content of variable otherwiseValue is returned. C# 8.0 introduces null-coalescing assignment, such that
A null coalescing operator is typically used to provide a default value to use when a variable is null -- and only when it is null, not zero or any other value (including false). The only way an operator in your above table can be considered a null coalescing operator is if it has Yes for the top row and No for every other row.
In Gosu, the ?: operator returns the right operand if the left is null as well. In C#, the null-conditional operator, ?. is referred to as the "Elvis operator", [10] but it does not perform the same function. Instead, the null-coalescing operator?? does. In ColdFusion and CFML, the Elvis operator was introduced using the ?: syntax.