Deep-Merge Two JSON Configs

Hard ⏱ 18 min 30% acceptance ★★★★★ 4.8

Write merge(base, override) deep-merging two parsed JSON dicts: when both hold a dict at the same key, merge recursively; otherwise override wins. Neither input may be mutated — return a new dict.

Examples

Example 1

Input

merge({'db': {'host': 'a', 'port': 5432}}, {'db': {'host': 'b'}})

Output

{'db': {'host': 'b', 'port': 5432}}

Explanation

host overridden, port inherited.

Constraints

Recursive dict-vs-dict merging.
Inputs untouched (copy as you go).

Topics

JSONdeep merge

Companies

HashiCorpDockerRed Hat

Hints

Hint 1

Start from dict(base) and lay override on top.

Hint 2

Recurse only when both sides are dicts.

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