FEEL Functions - Gnorion/BizVR GitHub Wiki
Functions FEEL has function literals (or anonymous functions) that you can use to create functions. The DMN specification currently does not provide an explicit way of declaring a variable as a function, but BizVR allows a function to be defined as a decision table
Example:
function(a, b) a + b In this example, the FEEL expression creates a function that adds the parameters a and b and returns the result.
In BizVR it can be defined as a decision table
Or if you want to include error checking: