JezK
Edit File: countoperation.js
// Copyright 2009 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. // Test pre- and postfix count operations. // Test value context. var a = 42; var b = {x:42}; var c = "x"; assertEquals(43, ++a); assertEquals(43, a); assertEquals(43, a++); assertEquals(44, a); assertEquals(43, ++b.x); assertEquals(43, b.x); assertEquals(43, b.x++); assertEquals(44, b.x); assertEquals(45, ++b[c]); assertEquals(45, b[c]); assertEquals(45, b[c]++); assertEquals(46, b[c]); // Test effect context. a = 42; b = {x:42}; c = "x"; assertEquals(1, eval("++a; 1")); assertEquals(43, a); assertEquals(1, eval("a++; 1")); assertEquals(44, a); assertEquals(1, eval("++b.x; 1")); assertEquals(43, b.x); assertEquals(1, eval("b.x++; 1")); assertEquals(44, b.x); assertEquals(1, eval("++b[c]; 1")); assertEquals(45, b[c]); assertEquals(1, eval("b[c]++; 1")); assertEquals(46, b[c]); // Test test context. a = 42; b = {x:42}; c = "x"; assertEquals(1, (++a) ? 1 : 0); assertEquals(43, a); assertEquals(1, (a++) ? 1 : 0); assertEquals(44, a); assertEquals(1, (++b.x) ? 1 : 0); assertEquals(43, b.x); assertEquals(1, (b.x++) ? 1 : 0); assertEquals(44, b.x); assertEquals(1, (++b[c]) ? 1 : 0); assertEquals(45, b[c]); assertEquals(1, (b[c]++) ? 1 : 0); assertEquals(46, b[c]); // Test value/test and test/value contexts. a = 42; b = {x:42}; c = "x"; assertEquals(43, ++a || 1); assertEquals(43, a); assertEquals(43, a++ || 1); assertEquals(44, a); assertEquals(43, ++b.x || 1); assertEquals(43, b.x); assertEquals(43, (b.x++) || 1); assertEquals(44, b.x); assertEquals(45, ++b[c] || 1); assertEquals(45, b[c]); assertEquals(45, b[c]++ || 1); assertEquals(46, b[c]); a = 42; b = {x:42}; c = "x"; assertEquals(1, ++a && 1); assertEquals(43, a); assertEquals(1, a++ && 1); assertEquals(44, a); assertEquals(1, ++b.x && 1); assertEquals(43, b.x); assertEquals(1, (b.x++) && 1); assertEquals(44, b.x); assertEquals(1, ++b[c] && 1); assertEquals(45, b[c]); assertEquals(1, b[c]++ && 1); assertEquals(46, b[c]); // Test count operations with parameters. function f(x) { x++; return x; } assertEquals(43, f(42)); function g(x) { ++x; return x; } assertEquals(43, g(42)); function h(x) { var y = x++; return y; } assertEquals(42, h(42)); function k(x) { var y = ++x; return y; } assertEquals(43, k(42)); // Test count operation in a test context. function countTestPost(i) { var k = 0; while (i--) { k++; } return k; } assertEquals(10, countTestPost(10)); function countTestPre(i) { var k = 0; while (--i) { k++; } return k; } assertEquals(9, countTestPre(10));