Data Helper 3: Deep Clone with Cycles

Challenge summary

Deeply clone cyclic JavaScript data while preserving repeated-reference relationships inside the copy.

What you'll practice

• Detect previously visited objects before descending recursively.
• Preserve cycles and shared references in the cloned graph.
• Copy supported nested values without mutating the source.

What Premium unlocks

Premium unlocks the runnable workspace, behavioral checks, implementation walkthrough, and edge-case discussion.