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// Test corner cases of for-of iteration over Arrays.
// The current SetObject::construct method uses a ForOfIterator to extract
// values from the array, so we use that mechanism to test ForOfIterator here.
//
// Check array length decreases changes during iteration.
//
function TestDecreaseArrayLength() {
function doIter(f, arr) {
return f(...new Set(arr));
}
function fun(a, b, c) {
var result = 0;
for (var i = 0; i < arguments.length; i++)
result += arguments[i];
return result;
}
var GET_COUNT = 0;
function getter() {
GET_COUNT++;
if (GET_COUNT == MID) {
arr.length = 0;
}
return M2;
}
var iter = ([])[Symbol.iterator]();
var iterProto = Object.getPrototypeOf(iter);
var OldNext = iterProto.next;
var NewNext = function () {
return OldNext.apply(this, arguments);
};
var TRUE_SUM = 0;
var N = 100;
var MID = N/2;
var M = 3;
var arr = new Array(M);
var ARR_SUM = 0;
for (var j = 0; j < M; j++) {
arr[j] = j;
ARR_SUM += j;
}
var M2 = (M/2)|0;
Object.defineProperty(arr, M2, {'get':getter});
var sum = 0;
for (var i = 0; i < N; i++) {
var oldLen = arr.length;
sum += doIter(fun, arr);
var newLen = arr.length;
if (oldLen == newLen)
TRUE_SUM += arr.length > 0 ? ARR_SUM : 0;
else
TRUE_SUM += 1
}
assertEq(sum, TRUE_SUM);
}
TestDecreaseArrayLength();
if (typeof reportCompare === "function")
reportCompare(true, true);
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