## countWhere() function [​](/content/docs/sdk/core.countwhere#countwhere-function "Direct link to countWhere(/index.html) function")

**Signature:**

```typescript
export declare function countWhere<T>(items: Iterable<T>, fn: (value: T) => boolean): number;
```

## Parameters [​](/content/docs/sdk/core.countwhere#parameters "Direct link to Parameters"/index.html)

| Parameter | Type | Description |
| --- | --- | --- |
| items | Iterable<T> |  |
| fn | (value: T) => boolean |  |

**Returns:**

number

- [countWhere() function](/content/docs/sdk/core.countwhere#countwhere-function/index.html)  
- [Parameters](/content/docs/sdk/core.countwhere#parameters/index.html)