You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: jsarray.rs
    path of file: ./repos/boa/examples/src/bin
    
    the code of the file until where you have to start completion: // This example shows how to manipulate a Javascript array using Rust code.

use boa_engine::{
    js_string,
    native_function::NativeFunction,
    object::{builtins::JsArray, FunctionObjectBuilder},
    string::utf16,
    Context, JsResult, JsValue,
};

fn main() -> JsResult<()> {
    // We create a new `Context` to create a new Javascript executor.
    let context = &mut Context::default();

    // Create an empty array.
    let array = JsArray::new(context);

    assert!(array.is_empty(context)?);

    array.push(js_string!("Hello, world"), context)?; // [ "Hello, world" ]
    array.push(true, context)?; // [ "Hello, world", true ]

    assert!(!array.is_empty(context)?);

    assert_eq!(array.pop(context)?, JsValue::new(true)); // [ "Hello, world" ]
    assert_eq!(
        array.pop(context)?,
        JsValue::new(js_string!("Hello, world"))
    ); // [ ]
    assert_eq!(array.pop(context)?, JsValue::undefined()); // [ ]

    array.push(1, context)?; // [ 1 ]

    assert_eq!(array.pop(context)?, JsValue::new(1)); // [ ]
    assert_eq!(array.pop(context)?, JsValue::undefined()); // [ ]

    array.push_items(
        &[
            JsValue::new(10),
            JsValue::new(11),
            JsValue::new(12),
            JsValue::new(13),
            JsValue::new(14),
        ],
        context,
    )?; // [ 10, 11, 12, 13, 14 ]

    array.reverse(context)?; // [ 14, 13, 12, 11, 10 ]

    assert_eq!(array.index_of(12, None, context)?, Some(2));

    // We can also use JsObject method `.get()` through the Deref trait.
    let element = array.get(2, conte
    
fn main() -> JsResult<()> {
    // We create a new `Context` to create a new Javascript executor.
    let context = &mut Context::default();

    // Create an empty array.
    let array = JsArray::new(context);

    assert!(array.is_empty(context)?);

    array.push(js_string!("Hello, world"), context)?; // [ "Hello, world" ]
    array.push(true, context)?; // [ "Hello, world", true ]

    assert!(!array.is_empty(context)?);

    assert_eq!(array.pop(context)?, JsValue::new(true)); // [ "Hello, world" ]
    assert_eq!(
        array.pop(context)?,
        JsValue::new(js_string!("Hello, world"))
    ); // [ ]
    assert_eq!(array.pop(context)?, JsValue::undefined()); // [ ]

    array.push(1, context)?; // [ 1 ]

    assert_eq!(array.pop(context)?, JsValue::new(1)); // [ ]
    assert_eq!(array.pop(context)?, JsValue::undefined()); // [ ]

    array.push_items(
        &[
            JsValue::new(10),
            JsValue::new(11),
            JsValue::new(12),
            JsValue::new(13),
            JsValue::new(14),
        ],
        context,
    )?; // [ 10, 11, 12, 13, 14 ]

    array.reverse(context)?; // [ 14, 13, 12, 11, 10 ]

    assert_eq!(array.index_of(12, None, context)?, Some(2));

    // We can also use JsObject method `.get()` through the Deref trait.
    let element = array.get(2, context)?; // array[ 0 ]
    assert_eq!(element, JsValue::new(12));
    // Or we can use the `.at(index)` method.
    assert_eq!(array.at(0, context)?, JsValue::new(14)); // first element
    assert_eq!(array.at(-1, context)?, JsValue::new(10)); // last element

    // Join the array with an optional separator (default ",").
    let joined_array = array.join(None, context)?;
    assert_eq!(&joined_array, utf16!("14,13,12,11,10"));

    array.fill(false, Some(1), Some(4), context)?;

    let joined_array = array.join(Some("::".into()), context)?;
    assert_eq!(&joined_array, utf16!("14::false::false::false::10"));

    let filter_callback = FunctionObjectBuilder::new(
        context.realm(),
        NativeFunction::from_fn_ptr(|_this, args, _context| {
            Ok(args.first().cloned().unwrap_or_default().is_number().into())
        }),
    )
    .build();

    let map_callback = FunctionObjectBuilder::new(
        context.realm(),
        NativeFunction::from_fn_ptr(|_this, args, context| {
            args.first()
                .cloned()
                .unwrap_or_default()
                .pow(&JsValue::new(2), context)
        }),
    )
    .build();

    let mut data = Vec::new();
    for i in 1..=5 {
        data.push(JsValue::new(i));
    }
    let another_array = JsArray::from_iter(data, context); // [ 1, 2, 3, 4, 5]

    let chained_array = array // [ 14, false, false, false, 10 ]
        .filter(filter_callback, None, context)? // [ 14, 10 ]
        .map(map_callback, None, context)? // [ 196, 100 ]
        .sort(None, context)? // [ 100, 196 ]
        .concat(&[another_array.into()], context)? // [ 100, 196, 1, 2, 3, 4, 5 ]
        .slice(Some(1), Some(5), context)?; // [ 196, 1, 2, 3 ]

    assert_eq!(&chained_array.join(None, context)?, utf16!("196,1,2,3"));

    let reduce_callback = FunctionObjectBuilder::new(
        context.realm(),
        NativeFunction::from_fn_ptr(|_this, args, context| {
            let accumulator = args.first().cloned().unwrap_or_default();
            let value = args.get(1).cloned().unwrap_or_default();

            accumulator.add(&value, context)
        }),
    )
    .build();

    assert_eq!(
        chained_array.reduce(reduce_callback, Some(JsValue::new(0)), context)?,
        JsValue::new(202)
    );

    context
        .global_object()
        .set(js_string!("myArray"), array, true, context)?;

    Ok(())
}