[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [treeCollect](./rc-js-util.treecollect.md) ## treeCollect() function Similar to a reducer, but without the return requirement. It otherwise behaves like [treeIterate()](./rc-js-util.treeiterate.md). **Signature:** ```typescript export declare function treeCollect>(node: TNode, collected: TRet, callback: (collected: TRet, node: TNode, parent: TNode | null, depth: number) => void): TRet; ``` ## Parameters

Parameter	Type	Description
node	TNode	The start point.
collected	TRet	The reduced value.
callback	(collected: TRet, node: TNode, parent: TNode \| null, depth: number) => void	Called for each node, including the start point.

**Returns:** TRet ## Remarks See [treeCollect()](./rc-js-util.treecollect.md).