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Array Pop vs setting array length
(version: 0)
Comparing array pop vs setting array length
Comparing performance of:
Array pop vs Array set length
Created:
4 years ago
by:
Guest
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Tests:
Array pop
let array = new Array(100000).fill(0); while (array.length > 0) { array.pop(); }
Array set length
let array = new Array(100000).fill(0); array.length = 0;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array pop
Array set length
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.15
Browser/OS:
Safari 26 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=623002" width="100%" height="500px"></iframe>
Test name
Executions per second
Array pop
2225.8 Ops/sec
Array set length
11620.5 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the JavaScript microbenchmark on MeasureThat.net. **Overview** The benchmark is designed to compare two approaches for manipulating arrays in JavaScript: 1. **Using `array.pop()`**: Removing elements from the end of an array using `pop()`. 2. **Setting the array length directly**: Setting the `length` property of an array directly. **Options compared** The two options are being compared: * **Array Pop**: Using `array.pop()` to remove elements from the end of the array. * **Set Length Directly**: Setting the `length` property of the array directly to a new value, without modifying individual elements. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: ### Array Pop Pros: * Easy to understand and implement. * Can be useful in certain scenarios where elements are not stored in memory (e.g., garbage collection). Cons: * Can lead to slower performance due to the overhead of iterating through the array until an element is removed. * May cause unnecessary re-allocations of memory, leading to slower performance. ### Set Length Directly Pros: * Can be faster than using `array.pop()` because it avoids the overhead of iterating through the array. * Reduces memory fragmentation and re-allocations, leading to better performance. Cons: * Requires explicit management of the `length` property, which can be error-prone if not done correctly. * May lead to unexpected behavior if not properly implemented (e.g., handling edge cases). **Library usage** There is no library mentioned in this benchmark. The code uses native JavaScript features to manipulate arrays. **Special JS feature or syntax** No special JS features or syntax are used in this benchmark. **Other alternatives** If you're interested in exploring other approaches, here are a few alternatives: 1. **Using `array.splice()`**: Removing elements from the array using `splice()`, which returns an array of removed elements. 2. **Using `Array.from()` and `fill()`**: Creating a new array with a specified length and filling it with a value. 3. **Using `map()` or `reduce()`**: Using these methods to create a new array with modified values. Keep in mind that each alternative has its own trade-offs, and the best approach depends on your specific use case and performance requirements. If you have any questions or would like more information on these alternatives, feel free to ask!
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Array(length).fill() vs Array.from({ length: length })
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