implements Array.prototype.every()

src/js.rs

@@ -103,6 +103,13 @@ extern {
     #[wasm_bindgen(method)]
     pub fn concat(this: &Array, array: &Array) -> Array;
 
+    /// The every() method tests whether all elements in the array pass the test
+    /// implemented by the provided function.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every
+    #[wasm_bindgen(method)]
+    pub fn every(this: &Array, predicate: &mut FnMut(JsValue, u32, Array) -> bool) -> bool;
+
     /// The fill() method fills all the elements of an array from a start index
     /// to an end index with a static value. The end index is not included.
     ///

tests/all/js_globals/Array.rs

@@ -589,3 +589,35 @@ fn length() {
         "#)
         .test()
 }
+
+#[test]
+fn every() {
+    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_every_number_is_even(array: &js::Array) -> bool {
+                array.every(&mut |el, _, _| el.as_f64().unwrap() % 2f64 == 0f64)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                const arrayEven = [2, 4, 6, 8];
+                const arrayOdd = [1, 3, 5, 7];
+                const arrayMixed = [2, 3, 4, 5];
+
+                assert(wasm.array_every_number_is_even(arrayEven));
+                assert(!wasm.array_every_number_is_even(arrayOdd));
+                assert(!wasm.array_every_number_is_even(arrayMixed));
+            }
+        "#)
+        .test()
+}