Props with Defaults

Props & Classeseasy

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

Implement `withDefaults(props, defaults)` returning props merged over defaults, so provided props win.

Input: withDefaults({"a":1}, {"a":0,"b":2})

Output: {"a":1,"b":2}

Input: withDefaults({}, {"x":5})

Output: {"x":5}

+ 1 hidden test run on Submit.

Common pitfalls

Approach & explanation (try first)

{ ...defaults, ...props } merges so that any prop the caller passed wins, while unspecified ones fall back to the default.

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