# Example: Data Transformation

## Example description
In this example `transformation.js` subscribes to the *Square* topic, applies a
simple transformation to the data it receives, and publishes it into a topic of
the same type, *Circle*.

## Running the example
To run the example:
* Run any *DDS* application that publishes the *Square* topic. For example run
`node ../simple/writer.js`; or run
[RTI Shapes Demo](https://www.rti.com/free-trial/shapes-demo) and create a *Square*
publisher.
* Run any *DDS* application that subscribes to the *Circle* topic. For example,
run `node ./reader.js`; or run
[RTI Shapes Demo](https://www.rti.com/free-trial/shapes-demo) and create a *Circle*
subscriber.
* Run the transformation application: `node transformation.js`