[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [atMostOne](./ibm-cloud-sdk-core.atmostone.md) ## atMostOne() function Verifies that no more than one of the given elements are defined. Returns true if one or none are defined, and false otherwise. **Signature:** ```typescript export declare function atMostOne(...args: any): boolean; ``` ## Parameters

Parameter	Type	Description
args	any	The spread of arguments to check

**Returns:** boolean false if more than one elements are defined, true otherwise