[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [arrayPushUnique](./rc-js-util.arraypushunique.md) ## arrayPushUnique() function Like `Array.push` but checks if the value is unique first. **Signature:** ```typescript export declare function arrayPushUnique(items: TItem[], itemToPush: TItem, getComparisonValue?: (item: TItem) => unknown): boolean; ``` ## Parameters

Parameter	Type	Description
items	TItem\[\]
itemToPush	TItem
getComparisonValue	(item: TItem) => unknown	_(Optional)_

**Returns:** boolean true if an element was pushed. ## Remarks See [arrayPushUnique()](./rc-js-util.arraypushunique.md).