Objects & Data

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1. 1 Implement `deepClone(obj)` — handle nested objects, arrays, and circular references. Hard
2. 2 Implement `deepEqual(a, b)`. Medium
3. 3 Implement `get(obj, 'a.b[0].c', default)` — a lodash-style safe getter. Medium
4. 4 Implement `flatten(arr)` and `flattenDepth(arr, depth)`. Medium
5. 5 Implement `groupBy(arr, keyFn)`. Easy
6. 6 Implement `chunk(arr, size)`. Easy