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Array.from() vs new Array() - map
(version: 0)
Testing the difference between creating filled arrays.
Comparing performance of:
new Array() vs Array.from()
Created:
3 years ago
by:
Guest
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Tests:
new Array()
new Array(500).fill({}).map(()=> ({a:5}))
Array.from()
Array.from({ length: 500 }).map(()=> ({a:5}))
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
new Array()
Array.from()
Fastest:
N/A
Slowest:
N/A
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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** The benchmark is designed to compare two approaches for creating filled arrays: 1. **new Array()**: This is the traditional way of creating an array in JavaScript. The `fill()` method is used to fill the array with a specified value. 2. **Array.from()**: This is a modern approach introduced in ECMAScript 2015 (ES6). It allows you to create an array from an iterable source, such as an object or an array. **Options Compared** In this benchmark, we have two test cases: * **new Array()**: This creates an empty array and then fills it with objects using the `fill()` method. * **Array.from()**: This uses the `Array.from()` method to create a new array from an iterable source (in this case, an object). **Pros and Cons** Here's a brief summary of the pros and cons of each approach: **new Array():** Pros: * Widely supported in older browsers * Easy to understand and implement Cons: * Can be slower for large arrays due to the overhead of the `fill()` method * May not perform as well on modern engines that optimize `fill()` internally **Array.from():** Pros: * Faster performance, especially for large arrays * More concise code * Widely supported in modern browsers Cons: * Requires ECMAScript 2015 (ES6) support * Can be less readable for developers unfamiliar with the syntax **Library/Function Used** In this benchmark, we're using the following libraries/functions: * `Array.from()`: This is a built-in JavaScript function introduced in ES6. * `new Array()` and `.fill()`: These are part of the traditional JavaScript array creation and manipulation. **Special JS Feature/Syntax** There's no special feature or syntax being used in this benchmark. However, if we were to expand the scope, we could explore other aspects of JavaScript performance, such as: * Using `let` or `const` instead of `var` * Utilizing `for...of` loops instead of traditional `for` loops * Leveraging modern engines' optimizations for complex algorithms **Other Alternatives** If you're interested in exploring alternative approaches, here are a few options: 1. **Svelte**: A lightweight JavaScript framework that uses a unique approach to component-based programming. 2. **Preact**: A smaller, faster alternative to React that shares many similarities with it. 3. **Web Workers**: A mechanism for running JavaScript code in parallel, which can be useful for CPU-intensive tasks. These alternatives might not directly relate to array creation and benchmarking, but they showcase the diversity of options available for building web applications. In summary, this benchmark provides a straightforward comparison between two approaches for creating filled arrays: traditional `new Array()` with `.fill()`, and modern `Array.from()`. The results will help you understand which approach performs better in your specific use case.
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