More return types. Basic example

src/FactorGraphs/Factor.php

@@ -10,7 +10,7 @@ abstract class Factor implements \Stringable
 {
     private array $messages = [];
 
-    private $messageToVariableBinding;
+    private HashMap $messageToVariableBinding;
 
     private string $name;
 

src/FactorGraphs/FactorGraph.php

@@ -4,14 +4,14 @@ namespace DNW\Skills\FactorGraphs;
 
 class FactorGraph
 {
-    private $variableFactory;
+    private VariableFactory $variableFactory;
 
-    public function getVariableFactory()
+    public function getVariableFactory(): VariableFactory
     {
         return $this->variableFactory;
     }
 
-    public function setVariableFactory(VariableFactory $factory)
+    public function setVariableFactory(VariableFactory $factory): void
     {
         $this->variableFactory = $factory;
     }

src/FactorGraphs/Schedule.php

@@ -4,7 +4,7 @@ namespace DNW\Skills\FactorGraphs;
 
 abstract class Schedule implements \Stringable
 {
-    protected function __construct(private $_name)
+    protected function __construct(private string $name)
     {
     }
 
@@ -12,6 +12,6 @@ abstract class Schedule implements \Stringable
 
     public function __toString(): string
     {
-        return (string) $this->_name;
+        return (string) $this->name;
     }
 }