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Kotlin null default value9/11/2023 ^ "MySQL :: MySQL 5.5 Reference Manual :: 12.3.2 Comparison Functions and Operators".^ "SQLite Query Language: Core Functions". It depends on what you choose null to mean and what you think is best for your use case.^ "PostgreSQL: Documentation: 9.1: Conditional Expressions"."PHP RFC: Null Coalescing Assignment Operator". ^ "ECMAScript 2020 Language Specification".^ " add support for the Elvis Operator - JBoss Issue Tracker". ^ "The Swift Programming Language (Swift 4): Basic Operators".Otherwise, the value of parameter is substituted": In Bourne shell (and derivatives), "If parameter is unset or null, the expansion of word is substituted. In contrast to the ternary conditional if operator used as x ? x : y, but like the binary Elvis operator used as x ?: y, the null coalescing operator is a binary operator and thus evaluates its operands at most once, which is significant if the evaluation of x has side-effects.Įxamples by languages Bourne-like Shells This behavior allows a default value to be defined for cases where a more specific value is not available. While its behavior differs between implementations, the null coalescing operator generally returns the result of its left-most operand if it exists and is not null, and otherwise returns the right-most operand. The null coalescing operator (called the Logical Defined-Or operator in Perl) is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, including C#, PowerShell as of version 7.0.0, Perl as of version 5.10, Swift, and PHP 7.0.0.
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