> For the complete documentation index, see [llms.txt](https://docs.heisenware.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.heisenware.com/app-builder/build-backend/functions/storage/data-store.md). # Data store The data store class provides an in-memory storage array to manage collections of data items or objects. Add, remove, update, and retrieve data points dynamically within your flows. Data remains in memory only and does not persist to disk. This class requires an instance. The code class name is `DataStore`. ### `create` Creates a new, empty data store instance. #### Parameters None. #### Output Returns the data store instance. ### `push` Adds an item to the end of the data store. #### Parameters

Input	Description	Type
`item`	The item or object to add to the data store.	any

#### Output Returns the new total length of the data store as an integer. #### Examples ```yaml # item id: 1 name: First Item ``` ### `pop` Removes and returns the last item from the end of the data store. #### Parameters None. #### Output Returns the removed item or object. ### `pushFront` Adds an item to the front of the data store. #### Parameters

Input	Description	Type
`item`	The item or object to add.	any

#### Output Returns the new total length of the data store as an integer. ### `popFront` Removes and returns the first item from the front of the data store. #### Parameters None. #### Output Returns the removed item or object. ### `get` Retrieves the item at a specific zero-based index. #### Parameters

Input	Description	Type
`index`	The zero-based index of the item to retrieve.	integer

#### Output Returns the item at the specified index. ### `set` Replaces the value of an item at a specific zero-based index. #### Parameters

Input	Description	Type
`index`	The zero-based index of the item to update.	integer
`value`	The new value to assign to the index.	any

#### Output Returns nothing. ### `update` Updates an item by merging new properties into it. The function matches items using an explicit lookup condition or an implicit ID field. #### Parameters

Input	Key	Description	Type
`data`		An object containing the new properties to merge into the item.	object
	`id`	The unique identifier used to match the target item if you omit the `where` input.	any
`where`		An optional selection object containing a single key-value pair to locate the item.	object

#### Output Returns nothing. #### Examples **Update with where condition** Finds the item where `email` equals `test@example.com` and modifies its status property. ```yaml # data status: archived # where email: test@example.com ``` **Update with implicit ID** Matches the target item using the provided `id` property because no `where` input is defined. ```yaml # data id: 123 status: completed ``` ### `length` Returns the current number of items in the data store. #### Parameters None. #### Output Returns the total count of items as an integer. ### `indexOf` Returns the zero-based index of the first occurrence of a specific item. #### Parameters

Input	Description	Type
`item`	The item to search for.	any

#### Output Returns the zero-based index as an integer, or `-1` if the item does not exist. ### `includes` Checks whether the data store contains a specific item. #### Parameters

Input	Description	Type
`item`	The item to search for.	any

#### Output Returns `true` if the item exists, or `false` if it does not. ### `removeAt` Removes the item at a specific zero-based index. #### Parameters

Input	Description	Type
`index`	The zero-based index of the item to remove.	integer

#### Output Returns an array containing the removed item. ### `toArray` Returns a shallow copy of all data store items as a standard array. #### Parameters None. #### Output Returns an array containing all stored items. ### `clear` Removes all items from the data store. #### Parameters None. #### Output Returns nothing. ### `delete` Removes the data store instance. #### Parameters None. #### Output Implies Returns nothing. {% hint style="danger" %} #### Permanent data loss Deleting removes the instance configuration, and all stored data is permanently lost. {% endhint %} --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.heisenware.com/app-builder/build-backend/functions/storage/data-store.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.