Function boa::builtins::function::make_builtin_fn

pub fn make_builtin_fn<N>(
    function: NativeFunction, 
    name: N, 
    parent: &GcObject, 
    length: usize, 
    interpreter: &Context
) where
    N: Into<String>, 

Creates a new member function of a Object or prototype.

A function registered using this macro can then be called from Javascript using:

parent.name()

See the javascript 'Number.toString()' as an example.

Arguments

function: The function to register as a built in function. name: The name of the function (how it will be called but without the ()). parent: The object to register the function on, if the global object is used then the function is instead called as name() without requiring the parent, see parseInt() as an example. length: As described at https://tc39.es/ecma262/#sec-function-instances-length, The value of the "length" property is an integer that indicates the typical number of arguments expected by the function. However, the language permits the function to be invoked with some other number of arguments.

If no length is provided, the length will be set to 0.