Added examples, improved recipe implementation

src/Recipe/Recipe.php

@@ -24,39 +24,59 @@ class Recipe implements RecipeInterface
     /** @var IngredientInterface[] */
     protected $ingredients = [];
 
-    public function setRecipeName(?string $name)
+    public function setRecipeName(?string $name): Recipe
     {
         $this->name = $name;
+        return $this;
     }
 
-    public function setRecipeAuthor(?string $author)
+    public function setRecipeAuthor(?string $author): Recipe
     {
         $this->author = $author;
+        return $this;
     }
 
-    public function setTags(array $tags)
+    public function setTags(array $tags): Recipe
     {
         $this->tags = $tags;
+        return $this;
     }
 
-    public function addTag(string $tag)
+    public function addTag(string $tag): Recipe
     {
         $this->tags[] = $tag;
+        return $this;
     }
 
-    public function setDescription(?string $description)
+    public function hasTag(string $tag): bool
+    {
+        return in_array($tag, $this->tags);
+    }
+
+    public function removeTag(string $tag): Recipe
+    {
+        $this->tags = array_filter($this->tags, function ($input) use ($tag) {
+            return $input != $tag;
+        });
+        return $this;
+    }
+
+    public function setDescription(?string $description): Recipe
     {
         $this->description = $description;
+        return $this;
     }
 
-    public function addIngredient(IngredientInterface $ingredient)
+    public function addIngredient(IngredientInterface $ingredient): Recipe
     {
         $this->ingredients[] = $ingredient;
+        return $this;
     }
 
-    public function setExtra(array $extra)
+    public function setExtra(array $extra): Recipe
     {
         $this->extra = $extra;
+        return $this;
     }
 
     /**