How to pass function callbacks? about chakracore-rs HOT 2 CLOSED

let filtered_array = fn_filter.call(&guard, &[&is_even]).unwrap();
// --->
let filtered_array = fn_filter.call_with_this(&guard, &array, &[&is_even]).unwrap();

extern crate chakracore as js;

use js::Property;

fn main() {
    let runtime = js::Runtime::new().unwrap();
    let context = js::Context::new(&runtime).unwrap();
    let guard = context.make_current().unwrap();

    // create a JavaScript Array
    let length = 10;
    let array = js::value::Array::new(&guard, length);
    for i in 0..length {
        array.set_index(&guard, i, &js::value::Number::new(&guard, i as i32));
    }

    // try filtering it
    let is_even = js::value::Function::new(&guard, Box::new(|guard, info| {
        let i = info.arguments[0].to_integer(guard);
        Ok(js::value::Boolean::new(guard, i % 2 == 0).into())
    }));

    let fn_filter = array.get(&guard, &Property::new(&guard, "filter")).into_function().unwrap();

    let filtered_array = fn_filter.call_with_this(&guard, &array, &[&is_even]);
    println!("filtered_array: {:?}", filtered_array);
}