---
title: "init(mappingTransform:)"
framework: appintents
role: symbol
role_heading: Initializer
path: "appintents/containscomparator/init(mappingtransform:)-3xuvt"
---

# init(mappingTransform:)

Declares support for the contains operator between a String property and user-supplied values.

## Declaration

```swift
init(mappingTransform: @escaping (InputType) -> ComparatorMappingType) where Property : EntityProperty<String>, PropertyType == String, InputType == String
```

## Parameters

- `mappingTransform`: Closure that transforms the user-supplied value into the ComparatorMappingType output type.

## See Also

### Creating a comparator

- [init(mappingTransform:)](appintents/containscomparator/init(mappingtransform:)-xvws.md)
- [init(mappingTransform:)](appintents/containscomparator/init(mappingtransform:)-7rx55.md)
- [init(withResolvers:mappingTransform:)](appintents/containscomparator/init(withresolvers:mappingtransform:)-4482k.md)