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Concat vs Spread for Large Arrayss
(version: 0)
Comparing performance of:
concat vs spread
Created:
4 years ago
by:
Guest
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Tests:
concat
Array(1000).concat(Array(1000))
spread
[...Array(1000), ...Array(1000)]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
concat
spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser/OS:
Chrome 135 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=600051" width="100%" height="500px"></iframe>
concat
804K/s
spread
45K/s
View exact numbers
Test name
Executions per second
✓
concat
804,377 Ops/sec
spread
45,376 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided benchmark. **Benchmark Definition JSON** The benchmark definition is a simple JavaScript expression that creates an array of 1000 elements and then concatenates two such arrays together. There are two variations: 1. `Array(1000).concat(Array(1000))` - This uses the `concat()` method to concatenate two arrays. 2. `[...Array(1000), ...Array(1000)]` - This uses the spread operator (`...`) to create a new array with two instances of 1000 elements. **Options Compared** The benchmark is comparing the performance of these two approaches: 1. **Concatenation using `concat()` method**: This method creates a new array and copies all elements from both arrays into it. 2. **Spread operator (`...`) for array concatenation**: This approach creates a new array with the spread operator, which creates a new instance of an array and copies elements from both arrays into it. **Pros and Cons** **Concatenation using `concat()` method:** Pros: * Easy to read and understand * Works well for small to medium-sized arrays Cons: * Creates a new array, which can be memory-intensive for large arrays * Can be slower than the spread operator approach due to the overhead of creating a new array **Spread operator (`...`) for array concatenation:** Pros: * More efficient in terms of memory usage, as it creates a new instance of an array without copying elements from both arrays * Can be faster than the `concat()` method approach due to the reduced overhead of creating a new array Cons: * Less intuitive and less readable than the `concat()` method approach * May not work as expected in older browsers that don't support the spread operator **Library Used** None, this benchmark is using native JavaScript features. **Special JS Feature/Syntax** Yes, the benchmark uses the spread operator (`...`) which was introduced in ECMAScript 2015 (ES6). This feature allows for more concise and expressive array creation and manipulation. **Other Considerations** * The benchmark is running on a Chrome browser with an Intel Mac OS X 10.15.7 environment. * The `ExecutionsPerSecond` value indicates the number of executions per second, which can be used to estimate the performance of each approach. **Alternative Approaches** * **Using a library or framework**: Other libraries like Lodash or Ramda might provide more optimized implementations for array concatenation and manipulation. However, this would add an additional dependency and potential overhead. * **Native implementation**: Some JavaScript engines, like V8 (used by Chrome), have native implementations for array concatenation that might be faster than the benchmarked approaches. * **Other algorithms**: There are other algorithms for array concatenation, such as using a `for` loop or `reduce()`, which might have different performance characteristics. However, these would likely require more complex code and may not be worth optimizing for in this specific benchmark. Keep in mind that the results of this benchmark should be taken as an indication of the relative performance of each approach on this specific test case and environment, rather than a definitive answer for all scenarios.
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Array.prototype.concat vs spread operator vs push with spread
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