isEmpty method for dict

commit_hash:f3e964657a07b8c6de490b7a7f105e9a5a3f1214

client/web/divkit/src/expressions/funcs/dict.ts

@@ -101,6 +101,13 @@ function containsKey(_ext: EvalContext, dict: DictValue, key: StringValue): Bool
     };
 }
 
+function isEmpty(_ext: EvalContext, dict: DictValue): BooleanValue {
+    return {
+        type: BOOLEAN,
+        value: Object.keys(dict.value).length ? 0 : 1
+    };
+}
+
 export function registerDict(): void {
     const STRING_VARARG = {
         type: STRING,
@@ -166,4 +173,5 @@ export function registerDict(): void {
     registerMethod('getArray', [DICT, STRING_VARARG], getDictArray);
     registerMethod('getDict', [DICT, STRING_VARARG], getDictDict);
     registerMethod('containsKey', [DICT, STRING], containsKey);
+    registerMethod('isEmpty', [DICT], isEmpty);
 }

test_data/expression_test_data/methods_dict.json

@@ -486,7 +486,8 @@
         }
       ],
       "platforms": [
-        "android"
+        "android",
+        "web"
       ]
     },
     {
@@ -503,7 +504,8 @@
         }
       ],
       "platforms": [
-        "android"
+        "android",
+        "web"
       ]
     }
   ]