[Home](./index.md) > [server](./server.md) > [IterationMap](./server.iterationmap.md) > [has](./server.iterationmap.has.md) ## IterationMap.has() method Returns true if the key exists in the IterationMap. **Signature:** ```typescript has(key: K): boolean; ``` ## Parameters

Parameter	Type	Description
key	K	The key to check.

**Returns:** boolean True if the key exists, false otherwise.