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Benchmark on spread and concat
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
Slowest:
N/A
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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 provided JSON represents a benchmark that compares two approaches for merging arrays in JavaScript: the traditional `concat()` method and the new ES6 spread operator (`...`). **Options compared:** 1. **Array.prototype.concat()**: This method concatenates two or more arrays and returns a new array. 2. **Spread operator (`...`)**: This is a shorthand syntax for creating a new array by spreading elements from an existing array. **Pros and Cons of each approach:** * `concat()`: + Pros: widely supported, well-established API, and easy to understand. + Cons: can lead to performance issues due to the creation of a new array, which requires additional memory allocation. * Spread operator (`...`): + Pros: more concise, efficient, and expressive than traditional concatenation methods. + Cons: may not be supported in older browsers or versions of JavaScript. **Library usage:** None of the test cases use any external libraries. The focus is on comparing built-in JavaScript features and APIs. **Special JS feature or syntax:** The spread operator (`...`) was introduced in ES6 (ECMAScript 2015). It's a shorthand way to create a new array by spreading elements from an existing array. **Benchmark preparation code:** The provided Script Preparation Code is empty, which means that the benchmark doesn't perform any additional setup or initialization before running the tests. The HTML Preparation Code is also empty, indicating that no specific HTML markup is required for this benchmark. **Other alternatives:** 1. **Array.prototype.push()**: Instead of concatenating arrays using `concat()`, you could use `push()` to add elements to an existing array. 2. **Array.prototype.slice()**: You could use `slice()` to create a shallow copy of an array and then concatenate it with another array using `concat()`. Keep in mind that these alternatives might not provide the same level of performance or conciseness as the spread operator, but they can be useful in specific situations where the traditional approaches are preferred.
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