Object Spread vs. Object.assign: What\'s the Performance and Functionality Trade-off for Setting Default Values?

Object spread vs. Object.assign

Problem

How do the performance and functionality of object spread and Object.assign differ when setting default values for an options object? The proposed solutions are:

• Object spread: options = {...optionsDefault, ...options};
• Object.assign: options = Object.assign({}, optionsDefault, options);

Answer

Object Spread

Advantages:

• Potentially less verbose in environments with native support.
• Standardized in ES2018, easier to compile.

Disadvantages:

• Literal and non-dynamic.

Object.assign

Advantages:

• Standardized, widely supported.
• Dynamic, allows for multiple sources.

Disadvantages:

• More verbose.
• Requires polyfill in environments without native support.

Additional Considerations

The commit that prompted the question utilized a user-defined library (object-assign) to simulate Object.assign functionality. This is an alternative to a Babel-compiled, Object Spread solution.

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