Object Spread vs. Object.assign(): Which Should You Use?

Object Spread vs. Object.assign: A Comparison

In JavaScript, merging and extending objects is often necessary. Two popular methods for this are object spread and Object.assign().

Object Spread

Using the object spread operator (...):

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

Advantages:

• Less verbose
• Can be compiled directly in environments without native support (if using a transpiler like Babel)

Disadvantages:

• Not as flexible as Object.assign()
• Only operates on literal values, not dynamic ones

Object.assign()

Using the Object.assign() function:

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

Advantages:

• Standardized and supported in most environments
• Allows for dynamic assignment using variable arguments
• Can be used to merge multiple objects easily

Disadvantages:

• More verbose than object spread
• May require polyfills for older browsers

Which to Use?

The appropriate method depends on the specific requirements:

• Object Spread: Use for simple merging of literal values, where verbosity is not a concern.
• Object.assign(): Use when dynamic object properties or multiple-object merging is required, but consider the browser support and potential need for polyfills.

Conclusion

Both object spread and Object.assign() provide effective ways to merge and extend objects. Understanding the advantages and disadvantages of each method allows developers to make informed decisions based on their specific requirements.

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