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Object.assign vs spread operator : owntest
(version: 0)
Comparing performance of:
Object.assign vs spread operator
Created:
7 years ago
by:
Guest
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Tests:
Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };
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Suite status:
<idle, ready to run>
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Test case name
Result
Object.assign
spread operator
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **What is being tested?** The benchmark measures the performance difference between two approaches: `Object.assign` and the spread operator (`...`). In the test cases, we have an object `params` with properties `b`, `c`, and `d`. The test creates a new object `other` using either `Object.assign` or the spread operator to merge `params` into it. **Options being compared:** * `Object.assign`: A method that takes multiple source objects as arguments and merges them into a single object. * Spread operator (`...`): A syntax feature introduced in ECMAScript 2015, which allows spreading an object's properties onto a new object. **Pros and Cons of each approach:** * **`Object.assign()`**: + Pros: - Well-established and widely supported method. - Can be used to merge objects from multiple sources. + Cons: - May not be the most efficient option, especially when dealing with large objects or complex merging scenarios. - In some cases, it can create new objects unnecessarily, leading to increased memory allocation. * **Spread operator (`...`)**: + Pros: - More concise and expressive syntax compared to `Object.assign()`. - Can be more efficient in terms of object creation, as it only creates a shallow copy of the original object's properties. + Cons: - Less well-established and may not work consistently across older browsers or Node.js versions. **Library usage:** None of the test cases use any external libraries. **Special JavaScript features/syntax:** The benchmark uses the spread operator (`...`), which is a relatively new feature introduced in ECMAScript 2015. This syntax allows spreading an object's properties onto a new object, creating a shallow copy. **Other considerations:** * Performance differences between `Object.assign()` and the spread operator can be significant, especially for large objects or complex merging scenarios. * The benchmark results show that the spread operator is generally faster than `Object.assign()`, but this may vary depending on the specific use case and browser/Node.js version. **Alternatives:** * Other methods to merge objects include: + Using a loop to iterate over properties and assign values manually (`for (const key in obj) { other[key] = obj[key]; }`). + Utilizing libraries like Lodash or Underscore.js, which provide optimized merging functions. + Implementing custom merging logic using techniques like Object.create() and prototype chaining.
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Object.assign() vs spread operator (New object)
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