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     23 
     24 This tests that arrays have holes that you can see the prototype through, not just missing values.
     25 
     26 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
     27 
     28 
     29 PASS var a = []; a.length = 1; showHoles(a) is '[hole]'
     30 PASS var a = []; a[0] = undefined; showHoles(a) is '[undefined]'
     31 PASS var a = []; a[0] = undefined; delete a[0]; showHoles(a) is '[hole]'
     32 PASS showHoles([0, , 2]) is '[0, hole, 2]'
     33 PASS showHoles([0, 1, ,]) is '[0, 1, hole]'
     34 PASS showHoles([0, , 2].concat([3, , 5])) is '[0, hole, 2, 3, hole, 5]'
     35 PASS showHoles([0, , 2, 3].reverse()) is '[3, 2, hole, 0]'
     36 PASS a = [0, , 2, 3]; a.shift(); showHoles(a) is '[hole, 2, 3]'
     37 PASS showHoles([0, , 2, 3].slice(0, 3)) is '[0, hole, 2]'
     38 PASS showHoles([0, , 2, 3].sort()) is '[0, 2, 3, hole]'
     39 PASS showHoles([0, undefined, 2, 3].sort()) is '[0, 2, 3, undefined]'
     40 PASS a = [0, , 2, 3]; a.splice(2, 3, 5, 6); showHoles(a) is '[0, hole, 5, 6]'
     41 PASS a = [0, , 2, 3]; a.unshift(4); showHoles(a) is '[4, 0, hole, 2, 3]'
     42 PASS showHoles([0, , 2, 3].filter(returnTrue)) is '[0, 2, 3]'
     43 PASS showHoles([0, undefined, 2, 3].filter(returnTrue)) is '[0, undefined, 2, 3]'
     44 PASS showHoles([0, , 2, 3].map(returnTrue)) is '[true, hole, true, true]'
     45 PASS showHoles([0, undefined, 2, 3].map(returnTrue)) is '[true, true, true, true]'
     46 PASS a = []; [0, , 2, 3].every(addToArrayReturnTrue); showHoles(a) is '[0, 2, 3]'
     47 PASS a = []; [0, undefined, 2, 3].every(addToArrayReturnTrue); showHoles(a) is '[0, undefined, 2, 3]'
     48 PASS a = []; [0, , 2, 3].forEach(addToArray); showHoles(a) is '[0, 2, 3]'
     49 PASS a = []; [0, undefined, 2, 3].forEach(addToArray); showHoles(a) is '[0, undefined, 2, 3]'
     50 PASS a = []; [0, , 2, 3].some(addToArrayReturnFalse); showHoles(a) is '[0, 2, 3]'
     51 PASS a = []; [0, undefined, 2, 3].some(addToArrayReturnFalse); showHoles(a) is '[0, undefined, 2, 3]'
     52 PASS [0, , 2, 3].indexOf() is -1
     53 PASS [0, undefined, 2, 3].indexOf() is 1
     54 PASS [0, , 2, 3].lastIndexOf() is -1
     55 PASS [0, undefined, 2, 3].lastIndexOf() is 1
     56 PASS showHoles([0, , 2]) is '[0, hole, 2]'
     57 PASS showHoles([0, 1, ,]) is '[0, 1, hole]'
     58 PASS showHoles([0, , 2].concat([3, , 5])) is '[0, peekaboo, 2, 3, peekaboo, 5]'
     59 PASS showHoles([0, , 2, 3].reverse()) is '[3, 2, peekaboo, 0]'
     60 PASS a = [0, , 2, 3]; a.shift(); showHoles(a) is '[peekaboo, 2, 3]'
     61 PASS showHoles([0, , 2, 3].slice(0, 3)) is '[0, peekaboo, 2]'
     62 PASS showHoles([0, , 2, 3].sort()) is '[0, 2, 3, hole]'
     63 PASS showHoles([0, undefined, 2, 3].sort()) is '[0, 2, 3, undefined]'
     64 PASS a = [0, , 2, 3]; a.splice(2, 3, 5, 6); showHoles(a) is '[0, hole, 5, 6]'
     65 PASS a = [0, , 2, 3]; a.unshift(4); showHoles(a) is '[4, 0, peekaboo, 2, 3]'
     66 PASS showHoles([0, , 2, 3].filter(returnTrue)) is '[0, peekaboo, 2, 3]'
     67 PASS showHoles([0, undefined, 2, 3].filter(returnTrue)) is '[0, undefined, 2, 3]'
     68 PASS showHoles([0, , 2, 3].map(returnTrue)) is '[true, true, true, true]'
     69 PASS showHoles([0, undefined, 2, 3].map(returnTrue)) is '[true, true, true, true]'
     70 PASS a = []; [0, , 2, 3].every(addToArrayReturnTrue); showHoles(a) is '[0, peekaboo, 2, 3]'
     71 PASS a = []; [0, undefined, 2, 3].every(addToArrayReturnTrue); showHoles(a) is '[0, undefined, 2, 3]'
     72 PASS a = []; [0, , 2, 3].forEach(addToArray); showHoles(a) is '[0, peekaboo, 2, 3]'
     73 PASS a = []; [0, undefined, 2, 3].forEach(addToArray); showHoles(a) is '[0, undefined, 2, 3]'
     74 PASS a = []; [0, , 2, 3].some(addToArrayReturnFalse); showHoles(a) is '[0, peekaboo, 2, 3]'
     75 PASS a = []; [0, undefined, 2, 3].some(addToArrayReturnFalse); showHoles(a) is '[0, undefined, 2, 3]'
     76 PASS [0, , 2, 3].indexOf() is -1
     77 PASS [0, , 2, 3].indexOf('peekaboo') is 1
     78 PASS [0, undefined, 2, 3].indexOf() is 1
     79 PASS [0, , 2, 3].lastIndexOf() is -1
     80 PASS [0, , 2, 3].lastIndexOf('peekaboo') is 1
     81 PASS [0, undefined, 2, 3].lastIndexOf() is 1
     82 PASS successfullyParsed is true
     83 
     84 TEST COMPLETE
     85 
     86