[Home](./index.md) > [@datashaper/schema](./schema.md) > [MergeArgs](./schema.mergeargs.md) ## MergeArgs interface Signature: ```typescript export interface MergeArgs extends InputColumnListArgs, OutputColumnArgs ``` Extends: [InputColumnListArgs](./schema.inputcolumnlistargs.md), [OutputColumnArgs](./schema.outputcolumnargs.md) ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [delimiter?](./schema.mergeargs.delimiter.md) | | string | (Optional) Delimiter to use when merging columns into a string. This is only necessary if MergeStrategy.Concat is used. If it is not supplied, the values are just mashed together. | | [prefix?](./schema.mergeargs.prefix.md) | | string | (Optional) Prefix to strip from column names when using unhot (only relevant if columns were originally onehot encoded with a prefix). | | [preserveSource?](./schema.mergeargs.preservesource.md) | | boolean | (Optional) Keep the original columns (default is to remove source columns). | | [strategy](./schema.mergeargs.strategy.md) | | [MergeStrategy](./schema.mergestrategy.md) | Strategy to use for merging the input columns | | [unhot?](./schema.mergeargs.unhot.md) | | boolean | (Optional) Indicates that columns should be "unhot" before merging. In other words, replace all 1s with the column name, and 0s with undefined. |