| // Copyright (C) 2014 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 14.5 |
| description: > |
| class subclass binding |
| ---*/ |
| class Base { |
| constructor(x, y) { |
| this.x = x; |
| this.y = y; |
| } |
| } |
| |
| var obj = {}; |
| class Subclass extends Base { |
| constructor(x, y) { |
| super(x,y); |
| assert.sameValue(this !== obj, true, "The result of `this !== obj` is `true`"); |
| } |
| } |
| |
| var f = Subclass.bind(obj); |
| assert.throws(TypeError, function () { f(1, 2); }); |
| var s = new f(1, 2); |
| assert.sameValue(s.x, 1, "The value of `s.x` is `1`"); |
| assert.sameValue(s.y, 2, "The value of `s.y` is `2`"); |
| assert.sameValue( |
| Object.getPrototypeOf(s), |
| Subclass.prototype, |
| "`Object.getPrototypeOf(s)` returns `Subclass.prototype`" |
| ); |
| |
| var s1 = new f(1); |
| assert.sameValue(s1.x, 1, "The value of `s1.x` is `1`"); |
| assert.sameValue(s1.y, undefined, "The value of `s1.y` is `undefined`"); |
| assert.sameValue( |
| Object.getPrototypeOf(s1), |
| Subclass.prototype, |
| "`Object.getPrototypeOf(s1)` returns `Subclass.prototype`" |
| ); |
| |
| var g = Subclass.bind(obj, 1); |
| assert.throws(TypeError, function () { g(8); }); |
| var s2 = new g(8); |
| assert.sameValue(s2.x, 1, "The value of `s2.x` is `1`"); |
| assert.sameValue(s2.y, 8, "The value of `s2.y` is `8`"); |
| assert.sameValue( |
| Object.getPrototypeOf(s), |
| Subclass.prototype, |
| "`Object.getPrototypeOf(s)` returns `Subclass.prototype`" |
| ); |