Call Method as Function

Properties and methods in a Rust custom type registered with the [Engine] can be called just like a regular function in Rust.

Unlike functions defined in script (for which all arguments are passed by value), native Rust functions may mutate the object (or the first argument if called in normal function call style).

Custom types, properties and methods can be disabled via the [no_object] feature.

let a = new_ts();   // constructor function
a.field = 500;      // property setter
a.update();         // method call, 'a' can be modified

update(a);          // <- this de-sugars to 'a.update()' thus if 'a' is a simple variable
                    //    unlike scripted functions, 'a' can be modified and is not a copy

let array = [ a ];

update(array[0]);   // <- 'array[0]' is an expression returning a calculated value,
                    //    a transient (i.e. a copy) so this statement has no effect
                    //    except waste a lot of time cloning

array[0].update();  // <- call this method-call style will update 'a'

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Call Method as Function

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