Add mapToArray to doc list

src/DocumentList.php

@@ -103,6 +103,24 @@ class DocumentList
         }
     }
 
+    /**
+     * Iterate the generator, extracting key/value pairs returned as an associative array
+     *
+     * @template TValue The type for the mapped value
+     * @param callable(TDoc): (int|string) $keyFunc The function to extract a key from the document
+     * @param callable(TDoc): TValue $valueFunc The function to extract a value from the document
+     * @return TValue[] An associative array of values, keyed by the extracted keys
+     * @throws DocumentException If this is called once the generator has been consumed
+     */
+    public function mapToArray(callable $keyFunc, callable $valueFunc): array
+    {
+        $results = [];
+        foreach ($this->items() as $item) {
+            $results[$keyFunc($item)] = $valueFunc($item);
+        }
+        return $results;
+    }
+
     /**
      * Ensure the statement is destroyed if the generator is not exhausted
      */