Type hinting in PHP 7 - array of objects -


maybe missed there option define function should have argument or return example array of user objects?

consider following code:

<?php  class user {     protected $name;      protected $age;      /**      * user constructor.      *      * @param $name      */     public function __construct(string $name, int $age)     {         $this->name = $name;         $this->age = $age;     }      /**      * @return mixed      */     public function getname() : string     {         return $this->name;     }      public function getage() : int     {         return $this->age;     } }  function finduserbyage(int $age, array $users) : array {     $result = [];     foreach ($users $user) {         if ($user->getage() == $age) {             if ($user->getname() == 'john') {                 // complicated code here                 $result[] = $user->getname(); // bug             } else {                 $result[] = $user;             }         }     }      return $result; }  $users = [     new user('john', 15),     new user('daniel', 25),     new user('michael', 15), ];  $matches = finduserbyage(15, $users);  foreach ($matches $user) {     echo $user->getname() . ' '.$user->getage() . "\n"; }

is there option in php7 tell function finduserbyage should return array of users? expect when type hinting added should possible haven't found info type hinting array of objects it's not included in php 7. if it's not included, have clue why not included when type hinting added?

it's not included.

if it's not included, have clue why not included when type hinting added?

with current array implementation, require checking array elements @ runtime, because array contains no type information.

it has been proposed php 5.6 rejected: rfc "arrayof" - interestingly not because of performance issues turned out neglible, because there no agreement in how should implemented. there objection incomplete without scalar type hints. if interested in whole discussion, read in mailing list archive.

imho array type hints provide benefit typed arrays, , i'd love see them implemented.

so maybe it's time new rfc , reopen discussion.

partial workaround:

you can type hint variadic arguments , write signature as

function finduserbyage(int $age, user ...$users) : array

usage:

finduserbyage(15, ...$userinput);

in call, argument $userinput "unpacked" single variables, , in method "packed" array $users. each item validated of type user. $userinput can iterator, converted array.

unfortunately there no similar workaround return types, , can use last argument.


Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more