This is the unpublished documentation of wasm-bindgen, the published documentation is available on the main Rust and WebAssembly documentation site . Features documented here may not be available in released versions of wasm-bindgen.

bool

T parameter &T parameter &mut T parameter T return value Option<T> parameter Option<T> return value JavaScript representation
Yes No No Yes Yes Yes A JavaScript boolean value

Example Rust Usage


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

#[wasm_bindgen]
pub fn take_bool_by_value(x: bool) {}

#[wasm_bindgen]
pub fn return_bool() -> bool {
    true
}

#[wasm_bindgen]
pub fn take_option_bool(x: Option<bool>) {}

#[wasm_bindgen]
pub fn return_option_bool() -> Option<bool> {
    Some(false)
}

#}

Example JavaScript Usage

import {
  take_char_by_value,
  return_char,
  take_option_bool,
  return_option_bool,
} from './guide_supported_types_examples';

take_bool_by_value(true);

let b = return_bool();
console.log(typeof b); // "boolean"

take_option_bool(null);
take_option_bool(undefined);
take_option_bool(true);

let c = return_option_bool();
if (c == null) {
  // ...
} else {
  console.log(typeof c); // "boolean"
}