1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 function pluck1(a, key) { 29 return a.map(function(item) { return item[key]; }); 30 }; 31 assertArrayEquals([2, 2], pluck1([[0, 0], [0, 0]], 'length')); 32 assertArrayEquals([1, 3], pluck1([[1, 2], [3, 4]], '0')); 33 34 function pluck2(a, key) { 35 return a.map(function(item) { return item[key]; }); 36 }; 37 assertArrayEquals([2, 2], pluck2(["ab", "cd"], 'length')); 38 assertArrayEquals(["a", "c"], pluck2(["ab", "cd"], '0')); 39 40 function pluck3(a, key) { 41 return a.map(function(item) { return item[key]; }); 42 }; 43 f = function() { 1 }; 44 f.prototype = g = function() { 2 }; 45 assertArrayEquals([g, g], pluck3([f, f], 'prototype')); 46 assertArrayEquals([undefined, undefined], pluck3([f, f], '0')); 47
