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Array creation 234234
(version: 0)
Comparing performance of:
First vs Second
Created:
5 years ago
by:
Guest
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Tests:
First
[].concat(Array.from({ length: 1000 }, (_, idx) => idx))
Second
[...Array(1000).keys()]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
First
Second
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 on MeasureThat.net! **What is tested?** The provided benchmark measures the performance of two different ways to create an array of numbers in JavaScript. The test case compares the execution time of: 1. Using `Array.from()` and concatenating it with `[ ]`. 2. Using destructuring assignment (`[...Array(1000).keys()]`). **Options compared:** The benchmark is comparing the performance of two different approaches to create an array of numbers: 1. **Using `Array.from()` and concatenation**: This approach creates a new array by iterating over a range of values using `Array.from()`. The resulting array is then concatenated with an empty array (`[ ]`) using the spread operator (`...`). 2. **Destructuring assignment**: This approach uses destructuring assignment to extract key-value pairs from the object `{ length: 1000, keys: () => Array(1000).keys() }`, and then assigns the result to a new variable (`[...Array(1000).keys()]`). **Pros and Cons of each approach:** 1. **Using `Array.from()` and concatenation**: * Pros: + Easy to understand and implement. + Can be useful for creating arrays with specific properties (e.g., length, keys). * Cons: + Creates a new array with the same elements as the original array, which can lead to unnecessary memory allocations. + May not be suitable for large datasets due to performance overhead. 2. **Destructuring assignment**: * Pros: + More concise and expressive than concatenation. + Can avoid creating a new array altogether by reusing the existing object's keys property. * Cons: + Less intuitive for non-JavaScript developers (e.g., those familiar with imperative programming). + May not be supported in older browsers or JavaScript engines. **Special JS feature or syntax:** The benchmark uses the spread operator (`...`) and destructuring assignment, which are modern JavaScript features. These features were introduced in ECMAScript 2015 (ES6) and have since become widely adopted in modern JavaScript development. **Other considerations:** * The benchmark is running on a desktop browser (Chrome 88) with a Windows operating system. * The `ExecutionsPerSecond` value indicates the number of times the test case was executed per second, which provides an idea of performance. **Alternatives:** If you're interested in exploring alternative approaches to creating arrays in JavaScript, here are some options: 1. **Using `Array.prototype.slice()`**: This approach creates a shallow copy of the original array using slicing. 2. **Using `Array.from()` with a generator**: This approach uses a generator function to create an iterator that yields numbers from 0 to 999. 3. **Using native WebAssembly (WASM)**: This approach uses WASM to compile JavaScript code into machine code, which can provide significant performance improvements for large-scale computations. I hope this explanation helps you understand the benchmark and its test cases!
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