c7eb436d09
Flags removed (all begin with "harmony-"): function-name instanceof iterator-close unicode-regexps regexp-exec regexp-subclass species BUG=v8:3566, v8:3648, v8:3699, v8:4093, v8:4447, v8:4602 Review-Url: https://codereview.chromium.org/2096933002 Cr-Commit-Position: refs/heads/master@{#37235}
68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Make sure it's an error if @@hasInstance isn't a function.
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(function() {
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var F = {};
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F[Symbol.hasInstance] = null;
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assertThrows(function() { 0 instanceof F; }, TypeError);
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})();
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// Make sure the result is coerced to boolean.
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(function() {
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var F = {};
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F[Symbol.hasInstance] = function() { return undefined; };
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assertEquals(0 instanceof F, false);
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F[Symbol.hasInstance] = function() { return null; };
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assertEquals(0 instanceof F, false);
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F[Symbol.hasInstance] = function() { return true; };
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assertEquals(0 instanceof F, true);
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})();
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// Make sure if @@hasInstance throws, we catch it.
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(function() {
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var F = {};
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F[Symbol.hasInstance] = function() { throw new Error("always throws"); }
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try {
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0 instanceof F;
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} catch (e) {
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assertEquals(e.message, "always throws");
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}
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})();
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// @@hasInstance works for bound functions.
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(function() {
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var BC = function() {};
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var bc = new BC();
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var bound = BC.bind();
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assertEquals(bound[Symbol.hasInstance](bc), true);
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assertEquals(bound[Symbol.hasInstance]([]), false);
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})();
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// if OrdinaryHasInstance is passed a non-callable receiver, return false.
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assertEquals(Function.prototype[Symbol.hasInstance].call(Array, []), true);
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assertEquals(Function.prototype[Symbol.hasInstance].call({}, {}), false);
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// OrdinaryHasInstance passed a non-object argument returns false.
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assertEquals(Function.prototype[Symbol.hasInstance].call(Array, 0), false);
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// Cannot assign to @@hasInstance with %FunctionPrototype%.
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(function() {
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"use strict";
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function F() {}
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assertThrows(function() { F[Symbol.hasInstance] = (v) => v }, TypeError);
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})();
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// Check correct invocation of @@hasInstance handler on function instance.
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(function() {
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function F() {}
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var counter = 0;
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var proto = Object.getPrototypeOf(F);
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Object.setPrototypeOf(F, null);
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F[Symbol.hasInstance] = function(v) { ++counter; return true };
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Object.setPrototypeOf(F, proto);
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assertTrue(1 instanceof F);
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assertEquals(1, counter);
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})();
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