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The #switch function selects between multiple alternatives based on an input string. {{#switch: test string | case1 = value for case 1 | ... | default value}} Equivalent to the switch statement found in some programming languages, it is a convenient way of dealing with multiple cases without having to chain lots of #if functions together ...
Optimizing compilers such as GCC or Clang may compile a switch statement into either a branch table or a binary search through the values in the cases. [6] A branch table allows the switch statement to determine with a small, constant number of instructions which branch to execute without having to go through a list of comparisons, while a ...
Example of branch table in Wikibooks for IBM S/360; Examples of, and arguments for, Jump Tables via Function Pointer Arrays in C/C++; Example code generated by 'Switch/Case' branch table in C, versus IF/ELSE. Example code generated for array indexing if structure size is divisible by powers of 2 or otherwise.
Switch statements can allow compiler optimizations, such as lookup tables. In dynamic languages, the cases may not be limited to constant expressions, and might extend to pattern matching , as in the shell script example on the right, where the '*)' implements the default case as a regular expression matching any string.
JavaScript – only within single- or double-quoted strings; Vimscript as first character of continued line; Backtick. PowerShell; Hyphen. SQL*Plus; Underscore. AutoIt; Cobra; Visual Basic; Xojo; Ellipsis (three dots) MATLAB: The ellipsis need not end the line, but text following it is ignored. [5]
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The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
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