Introduction

New in: 5.3.0 A function is a named snippet of text containing a Filter Expression. Functions can have named parameters which are available within the function as variables.

Functions are usually defined with the Pragma: \function:

\function my-function(parameter:"2")
[<parameter>multiply[1.5]]
\end

Functions can be invoked in several ways:

• Directly transclude functions with the syntax <<myfn param:"value">>
• Assign functions to widget attributes with the syntax <div class=<<myfn param:"value">>>
• Invoke functions via the function Operator with the syntax [function[myfn],[value],...]
• Directly invoke functions whose names contain a period as custom filter operators with the syntax [my.fn[value]] or [.myfn[value]]

How Functions Work

Functions are implemented as a special kind of variable. The only thing that distinguishes them from ordinary variables is the way that the parameters are handled.