Modules
To [Module Name]

Creates a function with no output.
//!OpenSCAD
module do_something() {
}
To [Module Name] Return

Creates a function with an output.
//!OpenSCAD
function do_something() = 0;
Creates a function with no output.
//!OpenSCAD
module do_something() {
}
Creates a function with an output.
//!OpenSCAD
function do_something() = 0;