[Home](./index.md) > [@datashaper/schema](./schema.md) > [FoldArgs](./schema.foldargs.md) ## FoldArgs interface Signature: ```typescript export interface FoldArgs extends InputColumnListArgs ``` Extends: [InputColumnListArgs](./schema.inputcolumnlistargs.md) ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [to?](./schema.foldargs.to.md) | | \[string, string\] | (Optional) Two-element array of names for the output \[key, value\] |