Number Slices: `[u8]`, `[i8]`, `[u16]`, `[i16]`, `[u32]`, `[i32]`, `[u64]`, `[i64]`, `[f32]`, `[f64]`, `[MaybeUninit<u8>]`, `[MaybeUninit<i8>]`, `[MaybeUninit<u16>]`, `[MaybeUninit<i16>]`, `[MaybeUninit<u32>]`, `[MaybeUninit<i32>]`, `[MaybeUninit<u64>]`, `[MaybeUninit<i64>]`, `[MaybeUninit<f32>]`, and `[MaybeUninit<f64>]`

`T` parameter	`&T` parameter	`&mut T` parameter	`T` return value	`Option<&T>` parameter	`Option<T>` return value	JavaScript representation
No	Yes	Yes	No	No	No	A JavaScript `TypedArray` view of the Wasm memory for the boxed slice of the appropriate type (`Int32Array`, `Uint8Array`, etc)

Note: Numeric MaybeUninit<T> can always be assumed to be initialized upon transmission from Rust to JS and vice-versa. However, uninitialized values coming from Rust might contain unspecified values.

Example Rust Usage

#![allow(unused)]
fn main() {
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub fn take_number_slice_by_shared_ref(x: &[f64]) {}

#[wasm_bindgen]
pub fn take_number_slice_by_exclusive_ref(x: &mut [u8]) {}
}

Example JavaScript Usage

import {
  take_number_slice_by_shared_ref,
  take_number_slice_by_exclusive_ref,
} from './guide_supported_types_examples';

take_number_slice_by_shared_ref(new Float64Array(100));
take_number_slice_by_exclusive_ref(new Uint8Array(100));