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// Stress test dictionary object/map property deletion/addition/compaction.
const numProps = 1000;
// Delete a range of properties and check correctness.
function deleteRange(deleteStart, deleteEnd) {
for (var i = 0; i < numProps; i++) {
o["x" + i] = i;
}
for (var i = deleteStart; i < deleteEnd; i++) {
delete o["x" + i];
}
assertEq(Object.getOwnPropertyNames(o).length,
numProps - (deleteEnd - deleteStart));
for (var i = 0; i < numProps; i++) {
if (deleteStart <= i && i < deleteEnd) {
assertEq(("x" + i) in o, false);
} else {
assertEq(o["x" + i], i);
}
}
}
// For every "stride" properties, delete all of them except one.
function deleteMany(stride) {
for (var i = 0; i < numProps; i++) {
o["x" + i] = i;
}
var propsNotDeleted = 0;
for (var i = 0; i < numProps; i++) {
if ((i % stride) === 1) {
propsNotDeleted++;
continue;
}
delete o["x" + i];
}
assertEq(Object.getOwnPropertyNames(o).length, propsNotDeleted);
for (var i = 0; i < numProps; i++) {
if ((i % stride) !== 1) {
assertEq(("x" + i) in o, false);
} else {
assertEq(o["x" + i], i);
}
}
}
var o = {};
function test(useFreshObject) {
function testOne(f) {
if (useFreshObject) {
o = {};
}
f();
}
for (var i = 6; i < 12; i++) {
testOne(_ => deleteRange(i, 1000));
}
testOne(_ => deleteRange(100, 1000));
testOne(_ => deleteRange(0, 1000));
testOne(_ => deleteRange(1, 1000));
testOne(_ => deleteRange(8, 990));
testOne(_ => deleteMany(3));
testOne(_ => deleteMany(7));
testOne(_ => deleteMany(8));
testOne(_ => deleteMany(15));
testOne(_ => deleteMany(111));
}
test(true);
o = {};
test(false);