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Array spread operator vs push 2
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method and push
Comparing performance of:
spread operator vs Push
Created:
6 years ago
by:
Guest
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Tests:
spread operator
[1,2,3,4,5,6,7,8,9].reduce((acc, item) => item % 2 ? [...acc, item] : acc, [])
Push
[1,2,3,4,5,6,7,8,9].reduce((acc, item) => item % 2 ? [...acc, item] : acc, [])
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread operator
Push
Fastest:
N/A
Slowest:
N/A
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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 Definition** The benchmark is designed to compare two approaches for adding an element to an array: the new ES6 spread operator (`...`) and the traditional `concat()` method with a `push` operation. The input array is `[1,2,3,4,5,6,7,8,9]`, and the reduction function is applied to each element. **Options Compared** There are two options being compared: 1. **Spread Operator (`...`)**: This approach uses the spread operator to create a new array by copying the elements from the original array. The syntax ` [...acc, item] ` creates a new array by adding `item` to the existing array `acc`. 2. **Traditional `concat()` Method with Push**: This approach uses the `concat()` method to add an element to the end of the array. The syntax `[...acc].push(item)` adds `item` to the end of the array. **Pros and Cons** * **Spread Operator (`...`)**: + Pros: concise, efficient, and modern. + Cons: may not work as expected in older browsers or environments that don't support the spread operator. * **Traditional `concat()` Method with Push**: + Pros: widely supported across different browsers and environments. + Cons: less efficient than the spread operator, as it creates a new array object each time. **Other Considerations** The benchmark is testing the performance of these two approaches on modern JavaScript engines. The test uses Firefox 69 as the reference browser, but you can run the benchmark on other browsers to see how they compare. If you want to modify the benchmark, you can change the input array or the reduction function. Keep in mind that changing the benchmark definition will affect its accuracy and relevance. **Library and Special JS Features** There are no libraries being used in this benchmark. However, it's worth noting that some modern JavaScript engines have built-in support for the spread operator (`...`). This is a feature introduced in ECMAScript 2018 (ES2018), which is why it might not work on older browsers. **Other Alternatives** If you want to test different approaches or add more variation to your benchmark, consider using other alternatives, such as: * Using a different reduction function (e.g., `forEach()`, `map()`, etc.) * Testing with larger input arrays * Adding noise or randomness to the data (e.g., to simulate real-world scenarios) * Running the benchmark on multiple browsers or environments to compare performance across different platforms
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