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// Copyright (C) 2022 Apple Inc. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.shift
description: >
A TypeError is thrown when "length" is [[Set]] on an array with non-writable "length".
info: |
Array.prototype.shift ( )
[...]
4. Let first be ? Get(O, "0").
[...]
8. Perform ? Set(O, "length", 𝔽(len - 1), true).
OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
[...]
2. If IsDataDescriptor(ownDesc) is true, then
a. If ownDesc.[[Writable]] is false, return false.
Set ( O, P, V, Throw )
[...]
1. Let success be ? O.[[Set]](P, V, O).
2. If success is false and Throw is true, throw a TypeError exception.
---*/
var array = new Array(1);
var arrayPrototypeGet0Calls = 0;
Object.defineProperty(Array.prototype, "0", {
get() {
Object.defineProperty(array, "length", { writable: false });
arrayPrototypeGet0Calls++;
},
});
assert.throws(TypeError, function() {
array.shift();
});
assert.sameValue(array.length, 1);
assert.sameValue(arrayPrototypeGet0Calls, 1);
reportCompare(0, 0);
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