# Filters

## SingleIndex

Selects a single input map element in a loop based on its index.

This function can only be used in the Filters argument of a loop expression.

### Properties

| Properties | Definitions |
| --- | --- |
| Index | Enter the index of the element to select. The first<br>element is 1.<br><br>This property is also available as<br>an argument. If you specify both, the argument value is used and<br>the property value is ignored. |

## IsValid

Returns true if an element is valid according to validation constraints.

This function can only be used in a loop expression that refers to an input element with a ValidateGroup function specified in its validation expression.