Struct Params

pub struct Params<'a, 'js> { /* private fields */ }

A struct which contains the values a callback is called with.

Arguments retrieved from the JavaScript side for calling Rust functions.

Implementations

impl<'a, 'js> Params<'a, 'js>

pub fn check_params(&self, num: ParamRequirement) -> Result<()>

Checks if the parameters fit the param num requirements.

pub fn ctx(&self) -> &Ctx<'js>

Returns the context associated with call.

pub fn function(&self) -> Value<'js>

Returns the value on which this function called. i.e. in bla.foo() the foo value.

pub fn this(&self) -> Value<'js>

Returns the this on which this function called. i.e. in bla.foo() the bla value.

pub fn arg(&self, index: usize) -> Option<Value<'js>>

Returns the argument at a given index..

pub fn len(&self) -> usize

Returns the number of arguments.

pub fn is_empty(&self) -> bool

Returns if there are no arguments

pub fn is_constructor(&self) -> bool

Returns if the function is called as a constructor.

If it is the value return by this is actually the new.target value.

pub fn access(self) -> ParamsAccessor<'a, 'js>

Turns the params into an accessor object for extracting the arguments.