rfc:pipe-operator-v2

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rfc:pipe-operator-v2 [2021/07/04 01:53] – Remove last PFA trace crellrfc:pipe-operator-v2 [2021/07/06 17:02] – Bring back references crell
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 ===== Additional semantics ===== ===== Additional semantics =====
  
-Functions that accept their first parameter by reference are supported, and will behave exactly as if they were called in the normal "inside out" fashion.  However, unless they return a value as well they are not of much use.+Functions that accept their first parameter by reference are allowed, as are functions that return by reference.  They will behave semantically the same as if they were passed a variable by reference or returned a variable by reference via a "normal" call.  In practice, however, reference variables are of little use in pipes so this is more of a design artifact than design intent.
  
 When evaluating a pipe, the left-hand side is fully evaluated first, then the right-hand side, then the right-hand side is invoked using the left-hand side.  That is, evaluation is strictly left-to-right. When evaluating a pipe, the left-hand side is fully evaluated first, then the right-hand side, then the right-hand side is invoked using the left-hand side.  That is, evaluation is strictly left-to-right.
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   * Laravel includes a [[https://github.com/illuminate/pipeline|Illuminate/Pipeline]] package that has an [[https://agoalofalife.medium.com/pipeline-and-php-d9bb0a6370ca|even more cumbersome syntax]].   * Laravel includes a [[https://github.com/illuminate/pipeline|Illuminate/Pipeline]] package that has an [[https://agoalofalife.medium.com/pipeline-and-php-d9bb0a6370ca|even more cumbersome syntax]].
   * The [[https://github.com/azjezz/psl|PHP Standard Library]] (PSL) library includes a [[https://github.com/azjezz/psl/blob/1.8.x/src/Psl/Fun/pipe.php|pipe function]], though it is more of a function concatenation operation.   * The [[https://github.com/azjezz/psl|PHP Standard Library]] (PSL) library includes a [[https://github.com/azjezz/psl/blob/1.8.x/src/Psl/Fun/pipe.php|pipe function]], though it is more of a function concatenation operation.
 +  * [[https://github.com/sebastiaanluca/php-pipe-operator|Sebastiaan Luca]] has a pipe library that works through abuse of the ''%%__call%%'' method.  It only works for named functions, I believe, not for arbitrary callables.
   * Various blogs speak of "the Pipeline Pattern" ([[https://medium.com/@aaronweatherall/the-pipeline-pattern-for-fun-and-profit-9b5f43a98130|for example]])   * Various blogs speak of "the Pipeline Pattern" ([[https://medium.com/@aaronweatherall/the-pipeline-pattern-for-fun-and-profit-9b5f43a98130|for example]])
  
rfc/pipe-operator-v2.txt · Last modified: 2021/07/20 15:34 by crell

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