Function Creation Process

Every function object has the following parameters:

• Name: This is the value that will appear in the selection in a Tag configuration. Here, you should use a descriptive name.

• ID: This technical reference can explicitly reference a function, as this ID is unique per DCP.

• Description: Feel free to describe your Function to better understand the motivation to this application later.

• Javascript: This is the actual function code that you will define

As a function is referenced in a tag to process and return a value, you must define an input and output value. Use the following basic syntax, as any function must return a value.

Functions can only work with one input. Adding more variables in the tag edit view will concatenate the inputs into a single parameter.

async function(input){
  var processed_value = input+1;
  return processed_value;
}

Transformation Functions

Any transformation function that runs server-side can fully support async features like `await` and `promise`.

Hence, if you intend to use async features, you must always declare the code to be async in the first line of code.

async function _(input) {
  // use await or promise if required
}

You can not use async features on client-side executed transformation functions, so the same transformation functions are not applicable to both client—and server-side tags.

Workaround for multiple arguments

If you need multiple input arguments, a possible workaround is to use a delimiter to concatenate the different variables and then split the information within the function.

Example Function Code

function  hashed_id_sha256(args) {
    let params = args.split(':::');
    let id = params[0];
    let account = params[1];

    if (['abc','cdf'].includes(account)) {
        return this.tools.getSHA256(id);
    }

    return id;
}