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            "boundTopicId": null,
            "title": "Make Object Immutable",
            "titleSlug": "make-object-immutable",
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            "exampleTestcases": "{\"x\":5}\n(obj) => { obj.x = 5; return obj.x; }\n[1,2,3]\n(arr) => { arr[1] = {}; return arr[2]; }\n{\"arr\":[1,2,3]}\n(obj) => { obj.arr.push(4); return 42; }\n{\"x\":2,\"y\":2}\n(obj) => { return Object.keys(obj); }",
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            "hints": [
                "Javascript has the concept of Proxy. That concept is critical to this problem.",
                "Recursively use proxy so that the user of the object is only able to access a proxy object.",
                "Override how set works. It should throw the correct error instead of actually setting a value."
            ],
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