Data Helper 2: Set Value by Path

Challenge summary

Assign a nested value from a path while creating missing containers and defending against unsafe keys.

What you'll practice

• Parse dot and bracket path segments consistently.
• Create arrays or objects according to the next path segment.
• Block prototype-pollution keys without partially mutating the target.

What Premium unlocks

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