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Array.from() vs new Array()
(version: 0)
Testing the difference between creating filled arrays.
Comparing performance of:
new Array() vs Array.from()
Created:
5 years ago
by:
Guest
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Tests:
new Array()
new Array(500).fill(0, 0, 500)
Array.from()
Array.from({ length: 500 }, () => 0)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
new Array()
Array.from()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
3 days ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36
Browser/OS:
Chrome 149 on Windows
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<iframe src="https://measurethat.net/Embed?id=629743" width="100%" height="500px"></iframe>
Test name
Executions per second
new Array()
2677257.0 Ops/sec
Array.from()
73448.2 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into explaining the benchmark. **What is being tested:** The provided JSON represents a JavaScript microbenchmarking test, specifically comparing two methods to create filled arrays in JavaScript: 1. `new Array(500).fill(0, 0, 500)` 2. `Array.from({ length: 500 }, () => 0)` These tests measure the performance difference between these two approaches. **Options being compared:** The main options being compared are: * **Dynamic array creation:** `new Array(500).fill(0, 0, 500)` (first test case) * **Array.from() with a callback function:** `Array.from({ length: 500 }, () => 0)` (second test case) **Pros and Cons of each approach:** 1. **Dynamic array creation (`new Array()`):** * Pros: + Simple and widely supported + Can be faster for small arrays due to cache efficiency * Cons: + Can lead to memory fragmentation issues if used extensively + May not work correctly in older browsers 2. **Array.from() with a callback function:** * Pros: + More efficient and scalable than dynamic array creation + Supports modern JavaScript features (e.g., arrow functions) * Cons: + Less supported by older browsers + Can be slower for very large arrays due to additional overhead **Other considerations:** When choosing between these approaches, consider the specific use case and requirements. If you need a simple, lightweight solution for small arrays, `new Array()` might suffice. However, if you're working with larger datasets or require more flexibility, `Array.from()` with a callback function is likely a better choice. **Library used:** In this test, there are no external libraries explicitly mentioned. However, some modern JavaScript features (e.g., arrow functions) rely on additional libraries like Babel to support older browsers. **Special JS feature or syntax:** There are no special JS features or syntax specifically highlighted in this benchmark. The tests focus on the performance difference between two well-established array creation methods. **Alternative approaches:** If you need an alternative way to create arrays, consider using: * **`Array.prototype.fill()`**: A more modern and efficient method for filling arrays. * **`Array.from() without a callback function`**: You can use `Array.from()` with no callback function to create an empty array or fill it with primitive values (e.g., numbers). * **Other libraries or modules**, such as `lodash`, which provide additional functions for working with arrays. Keep in mind that these alternatives might not be specifically suited for the performance-critical scenario depicted in this benchmark.
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my Array.from() vs new Array()
Array.from() vs new Array() - empty
Array.from() vs new A
Array() vs Array.from() fill
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