Object Spread vs. Object.assign: Which is Best for Setting Default Values?

Comparing Object Spread and Object.assign for Default Value Assignment

Consider a situation where you want to set default values for an existing options variable:

• Object Spread:

  <code class="javascript">options = {...optionsDefault, ...options};</code>

• Object.assign:

  <code class="javascript">options = Object.assign({}, optionsDefault, options);</code>

Object Spread

Advantages:

• Less verbose
• May be compilable in environments without native support (with tools like Babel)

Disadvantages:

• Literal syntax (not dynamic)

Object.assign

Advantages:

• Standardized
• Dynamic (allows for variable input sources)

Disadvantages:

• More verbose
• Requires polyfill in environments without native support

Choice Consideration

Regarding the specific commit mentioned, it utilized a user-defined polyfill for Object.assign rather than the native function. This may have been a preference to avoid including an external dependency in the build.

Ultimately, the choice between object spread and Object.assign depends on individual preferences and code requirements. For standardized and dynamic assignments, Object.assign is recommended, while object spread can be advantageous for brevity and compatibility with compilation tools.

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