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function f(arr)
{
assertEq(arr.shift(), 0);
}
function test(out)
{
// Create an array of arrays, to be iterated over for [].shift-calling. We
// can't just loop on shift on a single array with non-writable length because
// shift throws when called on an array with non-writable length.
var arrs = out.arrs = [];
for (var i = 0; i < 100; i++)
arrs.push([0, 1, 2, 3]);
// Use a much-greater capacity than the eventual non-writable length.
var a = [0, 1, 2, 3, 4, 5, 6, 7];
Object.defineProperty(a, "length", { writable: false, value: 4 });
arrs.push(a);
for (var i = 0, sz = arrs.length; i < sz; i++)
{
var arr = arrs[i];
f(arr);
}
}
var obj = {};
var a, arrs;
try
{
test(obj);
throw new Error("didn't throw!");
}
catch (e)
{
assertEq(e instanceof TypeError, true, "expected TypeError, got " + e);
arrs = obj.arrs;
assertEq(arrs.length, 101);
for (var i = 0; i < 100; i++)
{
assertEq(arrs[i].length, 3, "unexpected length for arrs[" + i + "]");
assertEq(arrs[i][0], 1, "bad element for arrs[" + i + "][0]");
assertEq(arrs[i][1], 2, "bad element for arrs[" + i + "][1]");
assertEq(arrs[i][2], 3, "bad element for arrs[" + i + "][2]");
assertEq(3 in arrs[i], false, "shouldn't be a third element");
assertEq(arrs[i][3], undefined);
}
a = arrs[100];
assertEq(a[0], 1, "bad element for a[" + i + "]");
assertEq(a[1], 2, "bad element for a[" + i + "]");
assertEq(a[2], 3, "bad element for a[" + i + "]");
assertEq(a.hasOwnProperty(3), false, "should have been deleted before throw");
assertEq(a[3], undefined);
assertEq(a.length, 4, "length shouldn't have been changed");
}
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