[Home](./index.md) > [puppeteer](./puppeteer.md) > [ExecutionContext](./puppeteer.executioncontext.md) > [queryObjects](./puppeteer.executioncontext.queryobjects.md)
## ExecutionContext.queryObjects() method
This method iterates the JavaScript heap and finds all the objects with the given prototype.
Signature:
```typescript
queryObjects(prototypeHandle: JSHandle): Promise;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| prototypeHandle | [JSHandle](./puppeteer.jshandle.md) | a handle to the object prototype |
Returns:
Promise<[JSHandle](./puppeteer.jshandle.md)>
A handle to an array of objects with the given prototype.
## Remarks
## Example
```js
// 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();
```