v8/test/mjsunit/array-iteration.js

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// Copyright 2008 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 for non-standard array iteration functions.
//
// See
//
// <http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:Array>
//
// for an explanation of each of the functions.
//
// Array.prototype.filter
//
(function() {
// Simple use.
var a = [0,1];
assertArrayEquals([0], a.filter(function(n) { return n == 0; }));
assertArrayEquals([0,1], a);
// Use specified object as this object when calling the function.
var o = { value: 42 }
a = [1,42,3,42,4];
assertArrayEquals([42,42], a.filter(function(n) { return this.value == n }, o))
// Modify original array.
a = [1,42,3,42,4];
assertArrayEquals([42,42], a.filter(function(n, index, array) { array[index] = 43; return 42 == n; }));
assertArrayEquals([43,43,43,43,43], a);
// Only loop through initial part of array eventhough elements are
// added.
a = [1,1];
assertArrayEquals([], a.filter(function(n, index, array) { array.push(n+1); return n == 2; }));
assertArrayEquals([1,1,2,2], a);
// Respect holes.
a = new Array(20);
var count = 0;
a[2] = 2;
a[15] = 2;
a[17] = 4;
var a = a.filter(function(n) { count++; return n == 2; });
assertEquals(3, count);
for (var i in a) assertEquals(2, a[i]);
// Create a new object in each function call when receiver is a
// primitive value. See ECMA-262, Annex C.
a = [];
[1, 2].filter(function() { a.push(this) }, "");
assertTrue(a[0] !== a[1]);
// Do not create a new object otherwise.
a = [];
[1, 2].filter(function() { a.push(this) }, {});
assertEquals(a[0], a[1]);
// In strict mode primitive values should not be coerced to an object.
a = [];
[1, 2].filter(function() { 'use strict'; a.push(this); }, "");
assertEquals("", a[0]);
assertEquals(a[0], a[1]);
})();
//
// Array.prototype.forEach
//
(function() {
// Simple use.
var a = [0,1];
var count = 0;
a.forEach(function(n) { count++; });
assertEquals(2, count);
// Use specified object as this object when calling the function.
var o = { value: 42 }
var result = [];
a.forEach(function(n) { result.push(this.value); }, o);
assertArrayEquals([42,42], result);
// Modify original array.
a = [0,1];
count = 0;
a.forEach(function(n, index, array) { array[index] = n + 1; count++; });
assertEquals(2, count);
assertArrayEquals([1,2], a);
// Only loop through initial part of array eventhough elements are
// added.
a = [1,1];
count = 0;
a.forEach(function(n, index, array) { array.push(n+1); count++; });
assertEquals(2, count);
assertArrayEquals([1,1,2,2], a);
// Respect holes.
a = new Array(20);
count = 0;
a[15] = 2;
a.forEach(function(n) { count++; });
assertEquals(1, count);
// Create a new object in each function call when receiver is a
// primitive value. See ECMA-262, Annex C.
a = [];
[1, 2].forEach(function() { a.push(this) }, "");
assertTrue(a[0] !== a[1]);
// Do not create a new object otherwise.
a = [];
[1, 2].forEach(function() { a.push(this) }, {});
assertEquals(a[0], a[1]);
// In strict mode primitive values should not be coerced to an object.
a = [];
[1, 2].forEach(function() { 'use strict'; a.push(this); }, "");
assertEquals("", a[0]);
assertEquals(a[0], a[1]);
})();
//
// Array.prototype.every
//
(function() {
// Simple use.
var a = [0,1];
assertFalse(a.every(function(n) { return n == 0 }));
a = [0,0];
assertTrue(a.every(function(n) { return n == 0 }));
assertTrue([].every(function(n) { return n == 0}));
// Use specified object as this object when calling the function.
var o = { value: 42 }
a = [0];
assertFalse(a.every(function(n) { return this.value == n; }, o));
a = [42];
assertTrue(a.every(function(n) { return this.value == n; }, o));
// Modify original array.
a = [0,1];
assertFalse(a.every(function(n, index, array) { array[index] = n + 1; return n == 1;}));
assertArrayEquals([1,1], a);
// Only loop through initial part of array eventhough elements are
// added.
a = [1,1];
assertTrue(a.every(function(n, index, array) { array.push(n + 1); return n == 1;}));
assertArrayEquals([1,1,2,2], a);
// Respect holes.
a = new Array(20);
var count = 0;
a[2] = 2;
a[15] = 2;
assertTrue(a.every(function(n) { count++; return n == 2; }));
assertEquals(2, count);
// Create a new object in each function call when receiver is a
// primitive value. See ECMA-262, Annex C.
a = [];
[1, 2].every(function() { a.push(this); return true; }, "");
assertTrue(a[0] !== a[1]);
// Do not create a new object otherwise.
a = [];
[1, 2].every(function() { a.push(this); return true; }, {});
assertEquals(a[0], a[1]);
// In strict mode primitive values should not be coerced to an object.
a = [];
[1, 2].every(function() { 'use strict'; a.push(this); return true; }, "");
assertEquals("", a[0]);
assertEquals(a[0], a[1]);
})();
//
// Array.prototype.map
//
(function() {
var a = [0,1,2,3,4];
// Simple use.
var result = [1,2,3,4,5];
assertArrayEquals(result, a.map(function(n) { return n + 1; }));
assertEquals(a, a);
// Use specified object as this object when calling the function.
var o = { delta: 42 }
result = [42,43,44,45,46];
assertArrayEquals(result, a.map(function(n) { return this.delta + n; }, o));
// Modify original array.
a = [0,1,2,3,4];
result = [1,2,3,4,5];
assertArrayEquals(result, a.map(function(n, index, array) { array[index] = n + 1; return n + 1;}));
assertArrayEquals(result, a);
// Only loop through initial part of array eventhough elements are
// added.
a = [0,1,2,3,4];
result = [1,2,3,4,5];
assertArrayEquals(result, a.map(function(n, index, array) { array.push(n); return n + 1;}));
assertArrayEquals([0,1,2,3,4,0,1,2,3,4], a);
// Respect holes.
a = new Array(20);
a[15] = 2;
a = a.map(function(n) { return 2*n; });
for (var i in a) assertEquals(4, a[i]);
// Create a new object in each function call when receiver is a
// primitive value. See ECMA-262, Annex C.
a = [];
[1, 2].map(function() { a.push(this) }, "");
assertTrue(a[0] !== a[1]);
// Do not create a new object otherwise.
a = [];
[1, 2].map(function() { a.push(this) }, {});
assertEquals(a[0], a[1]);
// In strict mode primitive values should not be coerced to an object.
a = [];
[1, 2].map(function() { 'use strict'; a.push(this); }, "");
assertEquals("", a[0]);
assertEquals(a[0], a[1]);
})();
//
// Array.prototype.some
//
(function() {
var a = [0,1,2,3,4];
// Simple use.
assertTrue(a.some(function(n) { return n == 3}));
assertFalse(a.some(function(n) { return n == 5}));
// Use specified object as this object when calling the function.
var o = { element: 42 };
a = [1,42,3];
assertTrue(a.some(function(n) { return this.element == n; }, o));
a = [1];
assertFalse(a.some(function(n) { return this.element == n; }, o));
// Modify original array.
a = [0,1,2,3];
assertTrue(a.some(function(n, index, array) { array[index] = n + 1; return n == 2; }));
assertArrayEquals([1,2,3,3], a);
// Only loop through initial part when elements are added.
a = [0,1,2];
assertFalse(a.some(function(n, index, array) { array.push(42); return n == 42; }));
assertArrayEquals([0,1,2,42,42,42], a);
// Respect holes.
a = new Array(20);
var count = 0;
a[2] = 42;
a[10] = 2;
a[15] = 42;
assertTrue(a.some(function(n) { count++; return n == 2; }));
assertEquals(2, count);
// Create a new object in each function call when receiver is a
// primitive value. See ECMA-262, Annex C.
a = [];
[1, 2].some(function() { a.push(this) }, "");
assertTrue(a[0] !== a[1]);
// Do not create a new object otherwise.
a = [];
[1, 2].some(function() { a.push(this) }, {});
assertEquals(a[0], a[1]);
// In strict mode primitive values should not be coerced to an object.
a = [];
[1, 2].some(function() { 'use strict'; a.push(this); }, "");
assertEquals("", a[0]);
assertEquals(a[0], a[1]);
})();