TypedArrays example for blogpost

TypedArrays.rs

/// Creates a typed JS array from a Rust slice
pub fn slice_to_array_buffer_view<T>(cx: *mut JSContext, data: &[T]) -> *mut JSObject 
    where T: ArrayBufferViewContents
{
    unsafe {
        let js_object = T::new(cx, data.len() as u32);
        assert!(!js_object.is_null());
        update_array_buffer_view(js_object, data);
        js_object
    }
}

/// Updates a typed JS array from a Rust slice
pub unsafe fn update_array_buffer_view<T>(obj: *mut JSObject, data: &[T])
    where T: ArrayBufferViewContents
{
    let mut buffer = array_buffer_view_data(obj);
    if let Some(ref mut buffer) = buffer {
        ptr::copy_nonoverlapping(&data[0], &mut buffer[0], data.len())
    }
}
```