From 68acbeab25f4d94ff35769e9d37e735dd2bc2d33 Mon Sep 17 00:00:00 2001
From: Matt Long <matthewhl@gmail.com>
Date: Wed, 20 Jun 2018 18:03:26 -0400
Subject: [PATCH] add binding for shift

---
 src/js.rs                     |  7 +++++++
 tests/all/js_globals/Array.rs | 31 +++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/src/js.rs b/src/js.rs
index 246fa759d..ca1cbc3e7 100644
--- a/src/js.rs
+++ b/src/js.rs
@@ -158,4 +158,11 @@ extern {
     /// http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse
     #[wasm_bindgen(method)]
     pub fn reverse(this: &Array) -> Array;
+
+    /// The shift() method removes the first element from an array and returns that removed element.
+    /// This method changes the length of the array.
+    ///
+    /// http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/shift
+    #[wasm_bindgen(method)]
+    pub fn shift(this: &Array) -> JsValue;
 }
\ No newline at end of file
diff --git a/tests/all/js_globals/Array.rs b/tests/all/js_globals/Array.rs
index 175267b43..2efa8150f 100644
--- a/tests/all/js_globals/Array.rs
+++ b/tests/all/js_globals/Array.rs
@@ -293,4 +293,35 @@ fn reverse() {
             }
         "#)
         .test()
+}
+
+#[test]
+fn shift() {
+    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 shift_item(this: &js::Array) -> JsValue {
+                this.shift()
+            }
+
+        "#)
+        .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 shiftedItem = wasm.shift_item(characters);
+
+                assert.equal(shiftedItem, 8);
+                assert.equal(characters.length, 5);
+            }
+        "#)
+        .test()
 }
\ No newline at end of file