Implement object keys access (#3832)

core/engine/src/object/operations.rs

@@ -343,6 +343,16 @@ impl JsObject {
         Ok(desc.is_some())
     }
 
+    /// Get all the keys of the properties of this object.
+    ///
+    /// More information:
+    ///  - [ECMAScript reference][spec]
+    ///
+    /// [spec]: https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots-ownpropertykeys
+    pub fn own_property_keys(&self, context: &mut Context) -> JsResult<Vec<PropertyKey>> {
+        self.__own_property_keys__(context)
+    }
+
     /// `Call ( F, V [ , argumentsList ] )`
     ///
     /// # Panics

examples/src/bin/properties.rs

@@ -0,0 +1,31 @@
+// This example shows how to access the keys and values of a `JsObject`
+
+use boa_engine::{
+    js_string, property::PropertyKey, Context, JsError, JsNativeError, JsValue, Source,
+};
+
+fn main() -> Result<(), JsError> {
+    // We create a new `Context` to create a new Javascript executor.
+    let mut context = Context::default();
+
+    let value = context.eval(Source::from_bytes("({ x: 10, '1': 20 })"))?;
+    let object = value
+        .as_object()
+        .ok_or_else(|| JsNativeError::typ().with_message("Expected object"))?;
+
+    let keys = object.own_property_keys(&mut context)?;
+
+    assert_eq!(
+        keys,
+        &[PropertyKey::from(1), PropertyKey::from(js_string!("x"))]
+    );
+
+    let mut values = Vec::new();
+    for key in keys {
+        values.push(object.get(key, &mut context)?);
+    }
+
+    assert_eq!(values, &[JsValue::from(20), JsValue::from(10)]);
+
+    Ok(())
+}