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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.
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.
Keys and values need not be the same type within an alist. Lisp and Scheme provide operators such as assoc to manipulate alists in ways similar to associative arrays. A set of operations specific to the handling of association lists exists for Common Lisp, each of these working non-destructively.
Ternary conditional operator; Null coalescing operators; Safe navigation operators; Modulo operators; ... Ruby <<<EOF I have a lot of things to say and so little time ...
Ternary conditional operator; Null coalescing operators; Safe navigation operators; Modulo operators; ... Ruby: 0 no no checked [36] array of array [23] yes ? Rust: 0 ...
Null coalescing operators; Safe navigation operators; Modulo operators; Evaluation strategy; List of "Hello World" programs; ... Ruby: variable = class.new ...
Ruby. Block comment in Ruby opens at =begin line and closes at =end line. S-Lang. The region of lines enclosed by the #<tag> and #</tag> delimiters are ignored by the interpreter. The tag name can be any sequence of alphanumeric characters that may be used to indicate how the enclosed block is to be deciphered.
I'm not sure if Perl's defined-or operator does the same thing like C#'s null coalescing operator, but any attempts to indentify JS's, Ruby's and Python's operators with // are wrong. The ||-operator works much the same in Perl and JS, whenever the Left-Hand-Side has a value which is FALSE in boolean context, the Right-H-S will be returned.