Implement Array.length binding

This commit is contained in:
robertdurst 2018-06-21 21:30:57 -07:00
parent 9e01e67aa3
commit a9ca64b689
2 changed files with 41 additions and 0 deletions

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@ -112,6 +112,13 @@ extern {
extern {
pub type Array;
/// The length property of an object which is an instance of type Array sets or returns the number of elements in that array.
/// The value is an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.
///
/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/length
#[wasm_bindgen(method, getter, structural)]
pub fn length(this: &Array) -> u32;
/// The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
///
/// http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf

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@ -422,3 +422,37 @@ fn includes() {
"#)
.test()
}
#[test]
fn length() {
project()
.file("src/lib.rs", r#"
#![feature(proc_macro, wasm_custom_section)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
use wasm_bindgen::js;
#[wasm_bindgen]
pub fn array_length(this: &js::Array) -> u32 {
this.length()
}
"#)
.file("test.ts", r#"
import * as assert from "assert";
import * as wasm from "./out";
export function test() {
let characters = [8, 5, 4, 3, 1, 2]
let charactersLength = wasm.array_length(characters);
assert.equal(charactersLength, 6);
var empty : number[] = [];
let emptyLength = wasm.array_length(empty);
assert.equal(emptyLength, 0);
}
"#)
.test()
}