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LibJS: Fix that constant declaration in for loop was mutable in body

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davidot 2022-11-30 01:45:35 +01:00 • committed by Andreas Kling
parent 714f0c3dce
commit 8319d7ac06
3 changed files with 34 additions and 4 deletions
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10
Userland/Libraries/LibJS/Tests/loops/for-in-basic.js
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@ -98,6 +98,16 @@ describe("special left hand sides", () => {
eval("for (f() in [0]) { expect().fail() }");
}).toThrowWithMessage(ReferenceError, "Invalid left-hand side in assignment");
});
test("Cannot change constant declaration in body", () => {
const vals = [];
for (const v in [1, 2]) {
expect(() => v++).toThrowWithMessage(TypeError, "Invalid assignment to const variable");
vals.push(v);
}
expect(vals).toEqual(["0", "1"]);
});
});
test("remove properties while iterating", () => {