The List block

The List block sends an array in your flow. You can define the items in the array by inserting data blocks into the List block. One List block can output an array where different items have different data types. For example, you could insert a Now block, a Bool block, and a String block into the List block. Each item in the List block has an index number next to it, indicating the item's position in the array. The first index number in the list is 0.

You can connect the List block to another block whose output you want to select information from to use as an item in the List block's output array. Insert a Select block into the List block and use it to select the desired information.

For example, when you want to add API response information to the array, connect the List block to an HTTP Request block. Then use a Select block to extract the desired element from the response.

Loops created with the For block often use a List block.

Input

The List block has no input port by default. When you insert a Select block into the List block, an input port appears where the inserted Select block can receive data from another block. You can then use the inserted Select block to choose a specific piece of data to be added to the List block's array. See Setup for more details. You can also insert List blocks into List blocks to create nested arrays.

Output

The List block has a single output port that sends an array when the block runs.

Setup

When you create a List block, it contains an empty array ([]). It has an index number, 0, but no items. To add items to the List block's array, select Add data blocks, then select a block from the dropdown list. The embedded block's data becomes an item in the List block's array. The item's index number appears next to the embedded block.

If you insert a Select block, it adds an input port to the List block. You can then connect another block's output port to the inserted Select block's input port, and select a specific piece of information from the incoming dat. The selected information becomes an item in the List block's array.

Example

To see the List block in an example flow, check out Flow Snippets: List.

Related blocks

You can insert another block into the List block to add its data as an item in the array. The blocks you can insert like this include the List block itself and the String, Bool, Number, Null, Select, Now, Date, Date & Time, List, Record, and Get Variable blocks.

Several blocks allow you to insert the List block inline, including the List block itself and the Evaluate, If, and Record, and blocks.