[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [setSetDifference](./rc-js-util.setsetdifference.md) ## setSetDifference() function returns items in A not in B. **Signature:** ```typescript export declare function setSetDifference(a: ReadonlySet, b: ReadonlySet): TItem[]; ``` ## Parameters

Parameter	Type	Description
a	ReadonlySet<TItem>
b	ReadonlySet<TItem>

**Returns:** TItem\[\] ## Remarks See [setSetDifference()](./rc-js-util.setsetdifference.md).