[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [arraySymmetricDifference](./rc-js-util.arraysymmetricdifference.md) ## arraySymmetricDifference() function Returns those items in A not in B, and those items in B not in A. **Signature:** ```typescript export declare function arraySymmetricDifference(a: readonly TItem[], b: readonly TItem[], aSet?: ReadonlySet, bSet?: ReadonlySet): Set; ``` ## Parameters

Parameter	Type	Description
a	readonly TItem\[\]
b	readonly TItem\[\]
aSet	ReadonlySet<TItem>	_(Optional)_
bSet	ReadonlySet<TItem>	_(Optional)_

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