Functions are units of code execution that are made up of multiple statements. Functions help to improve the reusability of code by encapsulating statements into reusable nuggets that can be invoked or called from multiple places. Azure ARM templates provide multiple functions to make the authoring of advanced templates both easy and versatile.
The output of an ARM template is always deterministic, meaning that no matter the number of times a template is executed or deployed, the end output will always be the same. It is for this reason that functions available with the ARM template do not provide functions based on randomness, date and time, or any other non-deterministic variable.
Almost all programming languages have functions as one of their important constructs. Functions are categorized to accept parameters from a caller and then return output after...