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

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

**Returns:** Set<TItem> ## Remarks See [arraySetDifference()](./rc-js-util.arraysetdifference.md).