| // Copyright 2016 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Flags: --harmony-instanceof |
| |
| // Make sure it's an error if @@hasInstance isn't a function. |
| (function() { |
| var F = {}; |
| F[Symbol.hasInstance] = null; |
| assertThrows(function() { 0 instanceof F; }, TypeError); |
| })(); |
| |
| // Make sure the result is coerced to boolean. |
| (function() { |
| var F = {}; |
| F[Symbol.hasInstance] = function() { return undefined; }; |
| assertEquals(0 instanceof F, false); |
| F[Symbol.hasInstance] = function() { return null; }; |
| assertEquals(0 instanceof F, false); |
| F[Symbol.hasInstance] = function() { return true; }; |
| assertEquals(0 instanceof F, true); |
| })(); |
| |
| // Make sure if @@hasInstance throws, we catch it. |
| (function() { |
| var F = {}; |
| F[Symbol.hasInstance] = function() { throw new Error("always throws"); } |
| try { |
| 0 instanceof F; |
| } catch (e) { |
| assertEquals(e.message, "always throws"); |
| } |
| })(); |
| |
| // @@hasInstance works for bound functions. |
| (function() { |
| var BC = function() {}; |
| var bc = new BC(); |
| var bound = BC.bind(); |
| assertEquals(bound[Symbol.hasInstance](bc), true); |
| assertEquals(bound[Symbol.hasInstance]([]), false); |
| })(); |
| |
| // if OrdinaryHasInstance is passed a non-callable receiver, return false. |
| assertEquals(Function.prototype[Symbol.hasInstance].call(Array, []), true); |
| assertEquals(Function.prototype[Symbol.hasInstance].call({}, {}), false); |
| |
| // OrdinaryHasInstance passed a non-object argument returns false. |
| assertEquals(Function.prototype[Symbol.hasInstance].call(Array, 0), false); |