getelem.js (1689B)
1 function testValue() { 2 function f(arr, x) { 3 return arr[x]; 4 } 5 var a = [1, undefined, null, Math, 2.1, ""]; 6 for (var i=0; i<50; i++) { 7 assertEq(f(a, 0), 1); 8 assertEq(f(a, 1), undefined); 9 assertEq(f(a, 2), null); 10 assertEq(f(a, 3), Math); 11 assertEq(f(a, 4), 2.1); 12 assertEq(f(a, 5), ""); 13 assertEq(f(a, -1), undefined); 14 assertEq(f(a, 6), undefined); 15 } 16 } 17 testValue(); 18 19 function testOutOfBounds() { 20 function f(arr, x) { 21 return arr[x]; 22 } 23 var a = [0, 1, 2, 3, 4]; 24 25 for (var j=0; j<4; j++) { 26 for (var i=0; i<5; i++) { 27 assertEq(f(a, i), i); 28 } 29 for (var i=5; i<10; i++) { 30 assertEq(f(a, i), undefined); 31 } 32 for (var i=-1; i>-10; i--) { 33 assertEq(f(a, i), undefined); 34 } 35 } 36 } 37 testOutOfBounds(); 38 39 function testHole() { 40 function f(arr, x) { 41 return arr[x]; 42 } 43 var a = [0, , 2, ]; 44 for (var i=0; i<70; i++) { 45 assertEq(f(a, 0), 0); 46 assertEq(f(a, 1), undefined); 47 assertEq(f(a, 2), 2); 48 assertEq(f(a, 3), undefined); 49 } 50 } 51 testHole(); 52 53 function testClassGuard() { 54 function f(arr) { 55 return arr[2]; 56 } 57 var a = [1, 2, 3, 4]; 58 for (var i=0; i<90; i++) { 59 assertEq(f(a), 3); 60 } 61 var b = {2: 100}; 62 assertEq(f(b), 100); 63 } 64 testClassGuard(); 65 66 function testGeneric1() { 67 function f(o, i) { 68 return o[i]; 69 } 70 for (var i=0; i<100; i++) { 71 assertEq(f("abc", 1), "b"); 72 assertEq(f("foo", "length"), 3); 73 assertEq(f([], -1), undefined); 74 assertEq(f({x: 1}, "x"), 1); 75 } 76 } 77 testGeneric1();