// Copyright 2010 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Tests the Function.prototype.bind (ES 15.3.4.5) method. // Simple tests. function foo(x, y, z) { return x + y + z; } var f = foo.bind(foo); assertEquals(3, f(1, 1, 1)); assertEquals(3, f.length); f = foo.bind(foo, 2); assertEquals(4, f(1, 1)); assertEquals(2, f.length); f = foo.bind(foo, 2, 2); assertEquals(5, f(1)); assertEquals(1, f.length); f = foo.bind(foo, 2, 2, 2); assertEquals(6, f()); assertEquals(0, f.length); // Test that length works correctly even if more than the actual number // of arguments are given when binding. f = foo.bind(foo, 1, 2, 3, 4, 5, 6, 7, 8, 9); assertEquals(6, f()); assertEquals(0, f.length); // Use a different bound object. var obj = {x: 42, y: 43}; // Values that would normally be in "this" when calling f_bound_this. var x = 42; var y = 44; function f_bound_this(z) { return z + this.y - this.x; } assertEquals(3, f_bound_this(1)) f = f_bound_this.bind(obj); assertEquals(2, f(1)); assertEquals(1, f.length); f = f_bound_this.bind(obj, 2); assertEquals(3, f()); assertEquals(0, f.length); // Test chained binds. // When only giving the thisArg, any number of binds should have // the same effect. f = foo.bind(foo); assertEquals(3, f(1, 1, 1)); f = foo.bind(foo).bind(foo).bind(foo).bind(foo); assertEquals(3, f(1, 1, 1)); assertEquals(3, f.length); // Giving bound parameters should work at any place in the chain. f = foo.bind(foo, 1).bind(foo).bind(foo).bind(foo); assertEquals(3, f(1, 1)); assertEquals(2, f.length); f = foo.bind(foo).bind(foo, 1).bind(foo).bind(foo); assertEquals(3, f(1, 1)); assertEquals(2, f.length); f = foo.bind(foo).bind(foo).bind(foo,1 ).bind(foo); assertEquals(3, f(1, 1)); assertEquals(2, f.length); f = foo.bind(foo).bind(foo).bind(foo).bind(foo, 1); assertEquals(3, f(1, 1)); assertEquals(2, f.length); // Several parameters can be given, and given in different bind invokations. f = foo.bind(foo, 1, 1).bind(foo).bind(foo).bind(foo); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo).bind(foo, 1, 1).bind(foo).bind(foo); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo).bind(foo, 1, 1).bind(foo).bind(foo); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo).bind(foo).bind(foo, 1, 1).bind(foo); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo).bind(foo).bind(foo).bind(foo, 1, 1); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo, 1).bind(foo, 1).bind(foo).bind(foo); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo, 1).bind(foo).bind(foo, 1).bind(foo); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo, 1).bind(foo).bind(foo).bind(foo, 1); assertEquals(3, f(1)); assertEquals(1, f.length); f = foo.bind(foo).bind(foo, 1).bind(foo).bind(foo, 1); assertEquals(3, f(1)); assertEquals(1, f.length); // Test constructor calls. function bar(x, y, z) { this.x = x; this.y = y; this.z = z; } f = bar.bind(bar); var obj2 = new f(1,2,3); assertEquals(1, obj2.x); assertEquals(2, obj2.y); assertEquals(3, obj2.z); f = bar.bind(bar, 1); obj2 = new f(2,3); assertEquals(1, obj2.x); assertEquals(2, obj2.y); assertEquals(3, obj2.z); f = bar.bind(bar, 1, 2); obj2 = new f(3); assertEquals(1, obj2.x); assertEquals(2, obj2.y); assertEquals(3, obj2.z); f = bar.bind(bar, 1, 2, 3); obj2 = new f(); assertEquals(1, obj2.x); assertEquals(2, obj2.y); assertEquals(3, obj2.z); // Test bind chains when used as a constructor. f = bar.bind(bar, 1).bind(bar, 2).bind(bar, 3); obj2 = new f(); assertEquals(1, obj2.x); assertEquals(2, obj2.y); assertEquals(3, obj2.z); // Test instanceof obj2 is bar, not f. assertTrue(obj2 instanceof bar); assertFalse(obj2 instanceof f);