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Spread vs Push -
(version: 0)
Comparing performance of:
spread vs push
Created:
4 years ago
by:
Guest
Go to the latest result
Tests:
spread
const x = [{a:1},{b:1}]; const y = [{c:3},...x];
push
const x = [{a:1},{b:1}]; const y = [{c:3}]; y.push(x[0]); y.push(x[1]);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
spread
push
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
8 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15
Browser/OS:
Safari 18 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=621223" width="100%" height="500px"></iframe>
spread
43.6M/s
push
36.6M/s
View exact numbers
Test name
Executions per second
✓
spread
43,569,344 Ops/sec
push
36,632,172 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in the provided JSON benchmark. **Benchmark Overview** The benchmark compares two approaches for spreading an array: using the spread operator (`...`) and using the `push` method with multiple calls. The goal is to measure which approach is faster, more efficient, and scalable. **Options Compared** There are two options being compared: 1. **Spread Operator (`...`)**: This approach uses the spread operator to create a new array by copying elements from the original array `x`. 2. **Push Method with Multiple Calls**: This approach pushes individual elements from the original array `x` onto the `y` array using multiple calls to the `push` method. **Pros and Cons of Each Approach** * **Spread Operator (`...`)**: + Pros: More concise, readable, and efficient way to create a new array. + Cons: Can be slower in certain scenarios due to the overhead of creating a new array object. * **Push Method with Multiple Calls**: + Pros: Can be faster in certain scenarios, especially when dealing with large arrays, as it avoids the overhead of creating a new array object. + Cons: More verbose and less readable than the spread operator approach. **Library Used** There is no explicit library used in this benchmark. However, it's possible that some built-in JavaScript methods or functions might be optimized to take advantage of certain features, such as array spreads. **Special JS Feature/Syntax** The benchmark does not use any special JavaScript features or syntax beyond the basic use of arrays and the spread operator. **Other Considerations** When measuring performance, other factors like memory allocation, garbage collection, and caching can also impact results. In this case, it's essential to note that the benchmark is running in a browser environment (Chrome 107) on a desktop platform with macOS 10.15.7. **Alternatives** If you're interested in exploring alternative approaches or optimizing your code for performance, consider the following: * Use `Array.prototype.slice()` or `Array.prototype.splice()` to create new arrays instead of using the spread operator. * Consider using array buffers or typed arrays for large-scale data processing. * Optimize your code by reducing unnecessary allocations and minimizing function calls. Keep in mind that optimizing performance should always be done with a focus on maintainability, readability, and scalability.
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