Merge Objects with Spread

Data Structures, Operators & Stringsmedium

Course · Section 9: Data Structures, Modern Operators and Strings · Lecture 111: The Spread Operator (...)

Implement `mergeDefaults(defaults, overrides)` that returns a new object combining both. Properties in `overrides` take precedence over those in `defaults`.

Sample tests

Input: mergeDefaults({"color":"red","size":"large"}, {"size":"small"})

Output: {"color":"red","size":"small"}

Input: mergeDefaults({"a":1}, {})

Output: {"a":1}

+ 1 hidden test run on Submit.

Hints

Common pitfalls

Spreading overrides before defaults lets defaults clobber them.

Learning resources

MDN: Spread syntax

Approach & explanation (try first)

Spreading defaults then the override object merges so provided values take precedence.

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