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// Case 1: splice() removes an element from the array.
{
let array = [];
array.push(0, 1, 2);
array.constructor = {
[Symbol.species]: function(n) {
// Increase the initialized length of the array.
array.push(3, 4, 5);
// Make the length property non-writable.
Object.defineProperty(array, "length", {writable: false});
return new Array(n);
}
}
assertThrowsInstanceOf(() => Array.prototype.splice.call(array, 0, 1), TypeError);
assertEq(array.length, 6);
assertEqArray(array, [1, 2, /* hole */, 3, 4, 5]);
}
// Case 2: splice() adds an element to the array.
{
let array = [];
array.push(0, 1, 2);
array.constructor = {
[Symbol.species]: function(n) {
// Increase the initialized length of the array.
array.push(3, 4, 5);
// Make the length property non-writable.
Object.defineProperty(array, "length", {writable: false});
return new Array(n);
}
}
assertThrowsInstanceOf(() => Array.prototype.splice.call(array, 0, 0, 123), TypeError);
assertEq(array.length, 6);
assertEqArray(array, [123, 0, 1, 2, 4, 5]);
}
if (typeof reportCompare === "function")
reportCompare(true, true);