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array concat
(version: 0)
Comparing performance of:
concat vs spread
Created:
7 years ago
by:
Registered User
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Tests:
concat
let arr = []; const arr1 = [1, 2]; arr = arr.concat(arr1);
spread
let arr = []; const arr1 = [1, 2]; arr = [...arr, ...arr1];
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
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its results. **Benchmark Overview** The benchmark is designed to measure the performance difference between two approaches for concatenating arrays in JavaScript: using the `concat()` method and using the spread operator (`...`). **Script Preparation Code** The script preparation code is not provided, but based on the benchmark definitions, it's likely that a simple JavaScript function is created that initializes an empty array `arr` and then performs either the concatenation using `concat()` or the spread operator. **Html Preparation Code** The HTML preparation code is also not provided, but typically, this would involve setting up some basic HTML structure to run the benchmark in a web browser. The specific HTML code is not relevant to the JavaScript performance comparison. **Options Compared** Two options are compared: 1. **`concat()`**: This method takes an array as an argument and returns a new array that contains all elements from both arrays. 2. **Spread Operator (`...`)**: This operator allows for spreading elements of an array into multiple arguments or creating a new array by concatenating elements. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * **`concat()`**: + Pros: widely supported, easy to read and write. + Cons: creates a new array, can be slower for large arrays. * **Spread Operator (`...`)**: + Pros: efficient, fast, and modern way of concatenating arrays. + Cons: requires modern JavaScript (ECMAScript 2015+) and may not work in older browsers or environments. **Library Usage** There is no library usage in this benchmark. Both approaches rely on built-in JavaScript features. **Special JS Feature/Syntax** The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015+. If the test case were written for an older browser or environment, it might not work as expected. **Other Alternatives** If you wanted to benchmark the performance of other array concatenation methods, some alternatives could be: * Using `Array.prototype.push()`: This method modifies the original array by adding elements to the end. * Using `reduce()`: This method applies a reduction function to each element in an array and returns a single value. Keep in mind that these alternative approaches might have different performance characteristics depending on the specific use case. **Benchmark Results** The benchmark results show the execution rate of both approaches for the given test cases. The spread operator (`...`) appears to be faster than `concat()` in this particular benchmark, with an average execution rate of 2.88 executions per second compared to 7.76 executions per second for `concat()`. However, please note that these results are specific to this benchmark and may not reflect the performance characteristics in all situations.
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