website/versioned_docs/version-24.40.0/api/puppeteer.page.queryobjects.md
This method iterates the JavaScript heap and finds all objects with the given prototype.
class Page {
abstract queryObjects<Prototype>(
prototypeHandle: JSHandle<Prototype>,
): Promise<JSHandle<Prototype[]>>;
}
Parameter
</th><th>Type
</th><th>Description
</th></tr></thead> <tbody><tr><td>prototypeHandle
</td><td>JSHandle<Prototype>
</td><td>a handle to the object prototype.
</td></tr> </tbody></table>Returns:
Promise<JSHandle<Prototype[]>>
Promise which resolves to a handle to an array of objects with this prototype.
// Create a Map object
await page.evaluate(() => (window.map = new Map()));
// Get a handle to the Map object prototype
const mapPrototype = await page.evaluateHandle(() => Map.prototype);
// Query all map instances into an array
const mapInstances = await page.queryObjects(mapPrototype);
// Count amount of map objects in heap
const count = await page.evaluate(maps => maps.length, mapInstances);
await mapInstances.dispose();
await mapPrototype.dispose();