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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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Deep immutability ensures that not only the top-level object but also all nested objects cannot be modified. This is important in state management systems and functional programming patterns where predictable data flow is required.
Yes, variations of immutability and object control frequently appear in frontend or JavaScript-focused interviews at large tech companies. Interviewers often test knowledge of Proxies, object freezing, and defensive programming patterns.
The most effective approach is using a JavaScript Proxy to intercept object operations. By blocking mutation operations such as set or delete and wrapping nested objects during access, you can enforce deep immutability efficiently.
The problem mainly relies on JavaScript's Proxy object and object traversal concepts. Proxies allow interception of property access and modification attempts, making them ideal for enforcing immutability rules.
