From 3d72a90481e662de514f373de3aae08bb2f05e62 Mon Sep 17 00:00:00 2001
From: Satoshi Amemiya <amemiya@protonmail.com>
Date: Wed, 27 Jun 2018 00:48:09 +0900
Subject: [PATCH] Support String.prototype.concat

---
 src/js.rs                        |  7 +++++++
 tests/all/js_globals/JsString.rs | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/src/js.rs b/src/js.rs
index cef43b16..65dabb18 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -447,6 +447,13 @@ extern {
     #[wasm_bindgen(method, js_class = "String", js_name = charAt)]
     pub fn char_at(this: &JsString, index: u32) -> JsString;
 
+
+    /// The concat() method concatenates the string arguments to the calling string and returns a new string.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat
+    #[wasm_bindgen(method, js_class = "String")]
+    pub fn concat(this: &JsString, string_2: &JsString) -> JsString;
+
     /// The indexOf() method returns the index within the calling String object of
     /// the first occurrence of the specified value, starting the search at fromIndex.
     /// Returns -1 if the value is not found.
diff --git a/tests/all/js_globals/JsString.rs b/tests/all/js_globals/JsString.rs
index 9bfe0ba4..ea302e54 100644
--- a/tests/all/js_globals/JsString.rs
+++ b/tests/all/js_globals/JsString.rs
@@ -31,6 +31,38 @@ fn char_at() {
         .test()
 }
 
+#[test]
+fn concat() {
+    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 string_concat(this: &js::JsString, string_2: &js::JsString) -> js::JsString {
+                this.concat(string_2)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                // TODO: Implement ability to receive multiple optional arguments
+                assert.equal(wasm.string_concat('Hello ', 'World'), 'Hello World');
+                assert.equal(wasm.string_concat('foo', {}), 'foo[object Object]');
+                assert.equal(wasm.string_concat('foo', []), 'foo');
+                assert.equal(wasm.string_concat('foo', null), 'foonull');
+                assert.equal(wasm.string_concat('foo', true), 'footrue');
+                assert.equal(wasm.string_concat('foo', 1234), 'foo1234');
+            }
+        "#)
+        .test()
+}
+
 #[test]
 fn starts_with() {
     project()