rfc:switch_expression

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rfc:switch_expression [2020/03/28 12:29] – Move to Under Discussion ilijatovilorfc:switch_expression [2020/03/28 21:37] – Replace InvalidArgumentException with UnhandledSwitchCaseError ilijatovilo
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 ====== PHP RFC: Switch expression ====== ====== PHP RFC: Switch expression ======
   * Date: 2020-03-28   * Date: 2020-03-28
-  * Author: Ilija Tovilo, ilija.tovilo@me.com+  * Author: Ilija Tovilo, tovilo.ilija@gmail.com
   * Author: Michał Brzuchalski, brzuchal@php.net   * Author: Michał Brzuchalski, brzuchal@php.net
   * Status: Under Discussion   * Status: Under Discussion
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 </code> </code>
  
-The unexpected value will go unnoticed until the program crashes in a weird way, causes strange behavior or even worse becomes a security hole. Many languages can check if all the cases are handled at compile time or force you to write a ''default'' case if they can't. For a dynamic language like PHP the only alternative is throwing an exception. We can't reasonably change the exhaustiveness behavior in the ''switch'' statement because it would break a lot of code. The ''switch'' expression resolves this issue by throwing an ''InvalidArgumentException'' if the condition isn't met for any of the cases and the ''switch'' doesn't contain a ''default'' case.+The unexpected value will go unnoticed until the program crashes in a weird way, causes strange behavior or even worse becomes a security hole. Many languages can check if all the cases are handled at compile time or force you to write a ''default'' case if they can't. For a dynamic language like PHP the only alternative is throwing an error. We can't reasonably change the exhaustiveness behavior in the ''switch'' statement because it would break a lot of code. The ''switch'' expression resolves this issue by throwing an ''UnhandledSwitchCaseError'' if the condition isn't met for any of the cases and the ''switch'' doesn't contain a ''default'' case.
  
 <code php> <code php>
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 $y = $x === 1 ? ... $y = $x === 1 ? ...
   : ($x === 2 ? ...   : ($x === 2 ? ...
-  : (($x === 3 ? ...+  : ($x === 3 ? ...
   : 0));   : 0));
 </code> </code>
rfc/switch_expression.txt · Last modified: 2020/04/12 00:04 by ilijatovilo

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