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https://github.com/fluencelabs/wasm-bindgen
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Add basic support for String.prototype.charAt() (#306)
* String - charAt() implementation * String - charAt() - add js_class
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@ -347,6 +347,13 @@ extern {
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/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice
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#[wasm_bindgen(method, js_class = "String")]
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pub fn slice(this: &JsString, start: u32, end: u32) -> JsString;
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/// The String object's charAt() method returns a new string consisting of the single
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/// UTF-16 code unit located at the specified offset into the string.
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///
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/// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charAt
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#[wasm_bindgen(method, js_class = "String", js_name = charAt)]
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pub fn char_at(this: &JsString, index: u32) -> JsString;
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}
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impl<'a> From<&'a str> for JsString {
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@ -2,6 +2,35 @@
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use project;
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#[test]
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fn char_at() {
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project()
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.file("src/lib.rs", r#"
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#![feature(proc_macro, wasm_custom_section)]
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extern crate wasm_bindgen;
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use wasm_bindgen::prelude::*;
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use wasm_bindgen::js;
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#[wasm_bindgen]
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pub fn string_char_at(this: &js::JsString, index: u32) -> js::JsString {
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this.char_at(index)
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}
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"#)
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.file("test.ts", r#"
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import * as assert from "assert";
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import * as wasm from "./out";
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var anyString = 'Brave new world';
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export function test() {
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assert.equal(wasm.string_char_at(anyString, 0), "B");
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assert.equal(wasm.string_char_at(anyString, 999), "");
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}
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"#)
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.test()
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}
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#[test]
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fn slice() {
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project()
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