[PHP] [User Modelling Example] Replace Data Value with Object for Age

Author: JavierCane

examples/php/php-user_modelling-02_value_objects/src/Age.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace CodelyTv\UserModelling;
+
+final class Age
+{
+    private const UNDERAGE_UNTIL_AGE = 18;
+
+    private int $value;
+
+    public function __construct(int $value)
+    {
+        $this->value = $value;
+    }
+
+    public function isUnderage(): bool
+    {
+        return $this->value < self::UNDERAGE_UNTIL_AGE;
+    }
+}

examples/php/php-user_modelling-02_value_objects/src/User.php

@@ -7,12 +7,11 @@
 final class User
 {
     private const SPANISH_LANGUAGE = "es";
-    private const UNDERAGE_UNTIL_AGE = 18;
 
     private string $locale;
-    private int    $age;
+    private Age $age;
 
-    public function __construct(string $locale, int $age)
+    public function __construct(string $locale, Age $age)
     {
         $this->locale = $locale;
         $this->age    = $age;
@@ -27,6 +26,6 @@ public function understandSpanish(): bool
 
     public function isUnderage(): bool
     {
-        return $this->age < self::UNDERAGE_UNTIL_AGE;
+        return $this->age->isUnderage();
     }
 }

examples/php/php-user_modelling-02_value_objects/tests/UserTest.php

@@ -4,6 +4,7 @@
 
 namespace CodelyTv\UserModelling\Test;
 
+use CodelyTv\UserModelling\Age;
 use CodelyTv\UserModelling\User;
 use PHPUnit\Framework\TestCase;
 
@@ -12,31 +13,31 @@ final class UserTest extends TestCase
     /** @test */
     public function should_detect_spanish_from_spain_as_spanish_language(): void
     {
-        $user = new User("es_ES", 20);
+        $user = new User("es_ES", new Age(20));
 
         self::assertTrue($user->understandSpanish());
     }
 
     /** @test */
     public function should_not_detect_english_from_great_britain_as_spanish_language(): void
     {
-        $user = new User("en_GB", 20);
+        $user = new User("en_GB", new Age(20));
 
         self::assertFalse($user->understandSpanish());
     }
 
     /** @test */
     public function should_detect_underage_users_until_18_years_old(): void
     {
-        $user = new User("en_GB", 17);
+        $user = new User("en_GB", new Age(17));
 
         self::assertTrue($user->isUnderage());
     }
 
     /** @test */
     public function should_not_detect_underage_users_starting_from_18_years_old(): void
     {
-        $user = new User("en_GB", 18);
+        $user = new User("en_GB", new Age(18));
 
         self::assertFalse($user->isUnderage());
     }