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Chaining concat, spread, push spread, push single
(version: 0)
Comparing performance of:
concat vs spread push vs spread vs push single
Created:
4 years ago
by:
Guest
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Tests:
concat
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { other = other.concat(params); } console.log(other);
spread push
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { other.push(...params); } console.log(other);
spread
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { other = [...other, ...params]; } console.log(other);
push single
var params = new Array(1000); let other = []; for (let x = 0; x < 100; ++x) { params.forEach(p => other.push(p)); } console.log(other);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
concat
spread push
spread
push single
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. **Benchmark Definition** The benchmark definition represents a single test case or "benchmark" that measures the performance of different approaches to concatenate arrays in JavaScript. There are four test cases: 1. `concat`: Uses the `concat()` method to combine two arrays. 2. `spread push`: Uses the spread operator (`...`) and the `push()` method to add elements to an array. 3. `spread`: Uses the spread operator (`...`) to create a new array by spreading existing arrays. 4. `push single`: Uses the `forEach()` loop with the `push()` method to iterate over an array and append its elements. **Options Compared** The benchmark compares the performance of different approaches to concatenate arrays: * **Concatenation using `concat()`, spread operator (`...`), and `push()`**: These approaches test the efficiency of combining arrays in different ways. * **Iteration using `forEach()` loop with `push()`**: This approach tests the performance of iterating over an array and appending its elements. **Pros and Cons** Here's a brief overview of the pros and cons of each approach: 1. **Concatenation using `concat()`, spread operator (`...`), and `push()`**: * Pros: Simple, easy to read, and well-supported in most browsers. * Cons: Can be slower due to the overhead of creating a new array or modifying an existing one. 2. **Iteration using `forEach()` loop with `push()`**: * Pros: Can be faster since it avoids the overhead of creating a new array or modifying an existing one. * Cons: May be less readable and less efficient for large arrays. **Library and Special JS Features** There are no specific libraries used in this benchmark. However, some features like `forEach()` loop with `push()` might require modern JavaScript versions (e.g., ECMAScript 2015+). **Other Alternatives** If you're interested in exploring alternative approaches to concatenate arrays or iterate over an array, consider the following: * **Array.prototype.slice()**: A more traditional approach to creating a new array by slicing an existing one. * **Array.prototype.reduce()**: An approach that uses the `reduce()` method to combine elements of two arrays. * **Array.prototype.map()`: An approach that uses the `map()` method to create a new array with transformed elements. These alternatives might provide different performance profiles and trade-offs in terms of readability and maintainability.
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