> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getoperate.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Loops

> For loops is a special type of steps that allows you to iterate over a list of items, given by an iterator expression.

## Configuration options

Clicking on the `For loop` step on the mini-map, it will open the `For loop` step editor. There are 4 configuration options:

### Iterator expression

The JS expression that will be evaluated to get the list of items to iterate over. You can also connect with a previous result that contain several items, it will iterate over all of them.

### Skip failure

If set to `true`, the loop will continue to the next item even if the current item failed.

### Run in parallel

Iif set to `true`, all iterations will be run in parallel.

### Parallelism

Assign a maximum number of branches run in parallel to control huge for-loops.

## Iterate on Steps

Steps within the flow can use both the iteration index and value. For example in `["Paris", "Lausanne", "Lille"]`, for iteration index "1", "Lausanne" is the value.