add binding for fill

tests/all/js_globals/Array.rs

@@ -138,4 +138,34 @@ fn slice() {
             }
         "#)
         .test()
+}
+
+#[test]
+fn fill() {
+    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 fill_with(this: &js::Array, value: JsValue, start: u32, end: u32) -> js::Array {
+                this.fill(value, start, end)
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let characters = ["a", "c", "x", "n", 1, "8"];
+                let subset = wasm.fill_with(characters, 0, 0, 3);
+
+                assert.equal(subset[0], 0);
+                assert.equal(subset[4], 1);
+            }
+        "#)
+        .test()
 }