More type checks

src/FactorGraphs/FactorGraphLayer.php

@@ -2,7 +2,6 @@
 
 namespace DNW\Skills\FactorGraphs;
 
-// edit this
 abstract class FactorGraphLayer
 {
     private array $_localFactors = [];
@@ -47,7 +46,7 @@ abstract class FactorGraphLayer
         $this->_inputVariablesGroups = $value;
     }
 
-    protected function scheduleSequence(array $itemsToSequence, $name)
+    protected function scheduleSequence(array $itemsToSequence, $name): ScheduleSequence
     {
         return new ScheduleSequence($name, $itemsToSequence);
     }

src/FactorGraphs/Schedule.php

@@ -8,7 +8,7 @@ abstract class Schedule implements \Stringable
     {
     }
 
-    abstract public function visit($depth = -1, $maxDepth = 0);
+    abstract public function visit(int $depth = -1, int $maxDepth = 0);
 
     public function __toString(): string
     {

src/FactorGraphs/ScheduleLoop.php

@@ -9,7 +9,7 @@ class ScheduleLoop extends Schedule
         parent::__construct($name);
     }
 
-    public function visit($depth = -1, $maxDepth = 0)
+    public function visit(int $depth = -1, int $maxDepth = 0)
     {
         $totalIterations = 1;
         $delta = $this->_scheduleToLoop->visit($depth + 1, $maxDepth);

src/FactorGraphs/Variable.php

@@ -4,22 +4,22 @@ namespace DNW\Skills\FactorGraphs;
 
 class Variable implements \Stringable
 {
-    private $_name;
+    private string $_name;
 
-    private $_value;
+    private mixed $_value;
 
-    public function __construct($name, private $_prior)
+    public function __construct(string $name, private mixed $_prior)
     {
         $this->_name = 'Variable['.$name.']';
         $this->resetToPrior();
     }
 
-    public function getValue()
+    public function getValue(): mixed
     {
         return $this->_value;
     }
 
-    public function setValue($value)
+    public function setValue(mixed $value): void
     {
         $this->_value = $value;
     }