pop-nonwritable-length-denseinitializedlength-below-length.js (1138B)
1 load(libdir + "asserts.js"); 2 3 function f(arr) 4 { 5 assertEq(arr.pop(), undefined); // if it doesn't throw 6 } 7 8 var N = 100; 9 10 function basic(out) 11 { 12 // Create an array of arrays, to be iterated over for [].pop-calling. We 13 // can't just loop on pop on a single array with non-writable length because 14 // pop throws when called on an array with non-writable length. 15 var arrs = out.arrs = []; 16 for (var i = 0; i < N; i++) 17 { 18 var arr = [0, 1, 2, 3, 4]; 19 arr.length = 6; 20 arrs.push(arr); 21 } 22 23 var a = [0, 1, 2, 3, 4]; 24 Object.defineProperty(a, "length", { writable: false, value: 6 }); 25 26 arrs.push(a); 27 28 for (var i = 0, sz = arrs.length; i < sz; i++) 29 f(arrs[i]); 30 } 31 32 var obj = {}; 33 var arrs, a; 34 35 assertThrowsInstanceOf(function() { basic(obj); }, TypeError); 36 37 var arrs = obj.arrs; 38 assertEq(arrs.length, N + 1); 39 for (var i = 0; i < N; i++) 40 { 41 assertEq(arrs[i].length, 5, "unexpected length for arrs[" + i + "]"); 42 assertEq(arrs[i].hasOwnProperty(5), false, 43 "element not deleted for arrs[" + i + "]"); 44 } 45 46 var a = arrs[N]; 47 assertEq(a.hasOwnProperty(5), false); 48 assertEq(a[5], undefined); 49 assertEq(a.length, 6);