LibJS: Add Array.prototype.every

Libraries/LibJS/Tests/Array.prototype.every.js

@@ -0,0 +1,44 @@
+load("test-common.js");
+
+try {
+    assert(Array.prototype.every.length === 1);
+
+    assertThrowsError(() => {
+        [].every(undefined);
+    }, {
+        error: TypeError,
+        message: "undefined is not a function"
+    });
+
+    var arrayOne = ["serenity", { test: "serenity"} ];
+    var arrayTwo = [true, false, 1, 2, 3, "3"];
+
+    assert(arrayOne.every(value => value === "hello") === false);
+    assert(arrayOne.every(value => value === "serenity") === false);
+    assert(arrayOne.every((value, index, arr) => index < 2) === true);
+    assert(arrayOne.every(value => typeof(value) === "string") === false);
+    assert(arrayOne.every(value => arrayOne.pop()) === true);
+
+    assert(arrayTwo.every((value, index, arr) => index > 0) === false);
+    assert(arrayTwo.every((value, index, arr) => index >= 0) === true);
+    assert(arrayTwo.every(value => typeof(value) !== "string") === false);
+    assert(arrayTwo.every(value => typeof(value) === "number") === false);
+    assert(arrayTwo.every(value => value > 0) === false);
+    assert(arrayTwo.every(value => value >= 0 && value < 4) === true);
+    assert(arrayTwo.every(value => arrayTwo.pop()) === true);
+
+    assert(["", "hello", "friends", "serenity"].every(value => value.length >= 0) === true);
+    assert([].every(value => value === 1) === true);
+
+    arrayTwo = [true, false, 1, 2, 3, "3"];
+
+    // Every only goes up to the original length.
+    assert(arrayTwo.every((value, index, arr) => {
+        arr.push("serenity");
+        return value < 4;
+    }) === true);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}