added filter and whereStartsWith

Author: taylorotwell

src/Illuminate/View/ComponentAttributeBag.php

@@ -83,6 +83,30 @@ public function except($keys)
         return new static($values);
     }
 
+    /**
+     * Filter the attributes, returning a bag of attributes that pass the filter.
+     *
+     * @param  callable  $callback
+     * @return static
+     */
+    public function filter($callback)
+    {
+        return new static(collect($this->attributes)->filter($callback)->all());
+    }
+
+    /**
+     * Return a bag of attributes that have keys starting with the given value / pattern.
+     *
+     * @param  string  $string
+     * @return static
+     */
+    public function whereStartsWith($string)
+    {
+        return $this->filter(function ($value, $key) use ($string) {
+            return Str::startsWith($key, $string);
+        });
+    }
+
     /**
      * Exclude the given attribute from the attribute array.
      *

tests/View/ViewComponentAttributeBagTest.php

@@ -11,6 +11,7 @@ public function testAttributeRetrieval()
     {
         $bag = new ComponentAttributeBag(['class' => 'font-bold', 'name' => 'test']);
 
+        $this->assertSame('class="font-bold"', (string) $bag->whereStartsWith('class'));
         $this->assertSame('class="mt-4 font-bold" name="test"', (string) $bag->merge(['class' => 'mt-4']));
         $this->assertSame('class="mt-4 font-bold" name="test"', (string) $bag->merge(['class' => 'mt-4', 'name' => 'foo']));
         $this->assertSame('class="mt-4 font-bold" id="bar" name="test"', (string) $bag->merge(['class' => 'mt-4', 'id' => 'bar']));