rfc:any_all_on_iterable

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rfc:any_all_on_iterable [2021/02/08 14:31] – tandrerfc:any_all_on_iterable [2021/02/22 15:28] – tandre
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 ====== PHP RFC: PHP\iterable\any() and all() on iterables ====== ====== PHP RFC: PHP\iterable\any() and all() on iterables ======
-  * Version: 0.4+  * Version: 0.6
   * Date: 2020-08-30   * Date: 2020-08-30
   * Author: Tyson Andre, tandre@php.net   * Author: Tyson Andre, tandre@php.net
-  * Status: Voting+  * Status: Declined
   * First Published at: https://wiki.php.net/rfc/any_all_on_iterable   * First Published at: https://wiki.php.net/rfc/any_all_on_iterable
   * Implementation: https://github.com/php/php-src/pull/6053   * Implementation: https://github.com/php/php-src/pull/6053
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 Add the functions ''PHP\iterable\any(iterable $input, ?callable $callback = null): bool'' and ''all(...)'' to PHP's standard library's function set. Add the functions ''PHP\iterable\any(iterable $input, ?callable $callback = null): bool'' and ''all(...)'' to PHP's standard library's function set.
 (The namespace ''PHP\iterable'' was preferred in [[rfc:any_all_on_iterable_straw_poll_namespace#vote|a straw poll that was previously sent out]]) (The namespace ''PHP\iterable'' was preferred in [[rfc:any_all_on_iterable_straw_poll_namespace#vote|a straw poll that was previously sent out]])
 +
 +**The implementation is equivalent to the following polyfill:**
  
 <code php> <code php>
 namespace PHP\iterable; namespace PHP\iterable;
  
-/** Determines whether any element of the iterable satisfies the predicate. */ +/** 
-function any(iterable $input, ?callable $callback = null) {+ * Determines whether any element of the iterable satisfies the predicate. 
 + * 
 + * 
 + * If the value returned by the callback is truthy 
 + * (e.g. true, non-zero number, non-empty array, truthy object, etc.), 
 + * this is treated as satisfying the predicate. 
 + * 
 + * @param iterable $input 
 + * @param null|callable(mixed):mixed $callback 
 + */ 
 +function any(iterable $input, ?callable $callback = null): bool {
     foreach ($input as $v) {     foreach ($input as $v) {
         if ($callback !== null ? $callback($v) : $v) {         if ($callback !== null ? $callback($v) : $v) {
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     return false;     return false;
 } }
-/** Determines whether all elements of the iterable satisfy the predicate */ +</code> 
-function all(iterable $input, ?callable $callback = null) {+<code php> 
 +/** 
 + * Determines whether all elements of the iterable satisfy the predicate. 
 + * 
 + * If the value returned by the callback is truthy 
 + * (e.g. true, non-zero number, non-empty array, truthy object, etc.), 
 + * this is treated as satisfying the predicate. 
 + * 
 + * @param iterable $input 
 + * @param null|callable(mixed):mixed $callback 
 + */ 
 +function all(iterable $input, ?callable $callback = null): bool {
     foreach ($input as $v) {     foreach ($input as $v) {
         if (!($callback !== null ? $callback($v) : $v)) {         if (!($callback !== null ? $callback($v) : $v)) {
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   - If this was provided only in userland, there'd be low adoption and code such as the above example (API::somePredicate()) would remain common.   - If this was provided only in userland, there'd be low adoption and code such as the above example (API::somePredicate()) would remain common.
   - If the standard library provided it, then polyfills for newer php functionality could adopt this as well, making cleaner code easier to write.   - If the standard library provided it, then polyfills for newer php functionality could adopt this as well, making cleaner code easier to write.
 +
 +==== Implementation Details ====
 +
 +When ''any()'' or ''all()'' are called with an iterable and a predicate, it internally checks if the value returned by the predicate is truthy (e.g. true, non-zero numbers, non-empty arrays, truthy objects, etc.)
 +
 +When ''any()'' or ''all()'' are called with only an iterable, it is equivalent to checking if any/all of the arguments are truthy. This is equivalent to calling ''any()''/''all()'' with ''fn ($x) => $x'', which is equivalent to calling it with ''fn($x) => (bool)$x''.
 +
 +
 +<code php>
 +php > var_export(PHP\iterable\any([false]));
 +false
 +php > var_export(PHP\iterable\any([true]));
 +true
 +php > var_export(PHP\iterable\any([0]));
 +false
 +php > var_export(PHP\iterable\any([1]));
 +true
 +php > var_export(PHP\iterable\any([0], fn($x) => $x));
 +false
 +php > var_export(PHP\iterable\any([1], fn($x) => $x));
 +true
 +
 +php > var_export(PHP\iterable\all([true, true, true], fn($x) => $x));
 +true
 +php > var_export(PHP\iterable\all([1, 2, 3], fn($x) => $x));
 +true
 +php > var_export(PHP\iterable\all([true, true, false], fn($x) => $x));
 +false
 +php > var_export(PHP\iterable\all([1, 2, 0], fn($x) => $x));
 +false
 +php > var_export(PHP\iterable\all([1, 2, 0]);
 +false
 +</code>
  
 ==== Secondary Vote: any()/all() or any_value()/all_values() ==== ==== Secondary Vote: any()/all() or any_value()/all_values() ====
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 ===== Vote ===== ===== Vote =====
  
-Add ''PHP\iterable\any(iterable $input, ?callable $callback = null)'' and ''PHP\iterable\all(...)'' (yes/no, requiring a 2/3 majority)+Add ''PHP\iterable\any(iterable $input, ?callable $callback = null): bool'' and ''PHP\iterable\all(iterable $input, ?callable $callback = null): bool'' (yes/no, requiring a 2/3 majority)
  
-Voting started on 2021-02-08 and ends on 2021-02-22.+Voting started on 2021-02-08 and ended on 2021-02-22.
  
-<doodle title="Add PHP\iterable\any() and all() to PHP?" voteType="single" auth="tandre" closed="false">+<doodle title="Add PHP\iterable\any() and all() to PHP?" voteType="single" auth="tandre" closed="true">
    * Yes    * Yes
    * No    * No
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    * any()/all()    * any()/all()
    * any_value()/all_values()    * any_value()/all_values()
 +</doodle>
 +
 +==== Straw Poll ====
 +
 +<doodle title="Reasons for voting against this RFC" voteType="multi" auth="tandre" closed="false">
 +   * Too small in scope
 +   * Object to the choice of namespace
 +   * Prefer the global namespace
 +   * Confused about the implementation
 +   * Prefer userland solutions
 +   * Other
 +   * Voted for this RFC
 </doodle> </doodle>
  
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   * 0.3: Add more quotes   * 0.3: Add more quotes
   * 0.4: Change name to ''PHP\iterable\all'' and ''PHP\iterable\any'', add a secondary vote on ''any/all'' vs ''any_value()/all_values()''   * 0.4: Change name to ''PHP\iterable\all'' and ''PHP\iterable\any'', add a secondary vote on ''any/all'' vs ''any_value()/all_values()''
 +  * 0.5: Add straw poll
 +  * 0.6: Add examples of how this works, add in missing return type, clarify treatment of predicate $callback return type
rfc/any_all_on_iterable.txt · Last modified: 2021/06/13 14:36 by tandre

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