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Slice vs Pop
(version: 0)
Comparing performance of:
Slice vs Pop
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = [1, 3, 5, 11, 13];
Tests:
Slice
arr.slice(0, -1);
Pop
arr.pop();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Slice
Pop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
3 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:144.0) Gecko/20100101 Firefox/144.0
Browser/OS:
Firefox 144 on Linux
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Test name
Executions per second
Slice
29429070.0 Ops/sec
Pop
153144704.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in this JavaScript microbenchmark. **Benchmark Definition JSON** The provided JSON defines two benchmark tests: 1. **Slice vs Pop**: This is the main benchmark, which compares the performance of `Array.prototype.slice()` and `Array.prototype.pop()` methods. 2. The script preparation code creates an array `arr` with a few elements: `[1, 3, 5, 11, 13]`. 3. There's no HTML preparation code provided. **Options Compared** The benchmark tests two options: a. **Pop**: This method removes and returns the last element from the array. b. **Slice**: This method creates a new array containing all elements from the original array, excluding the specified end index. **Pros and Cons of Each Approach** 1. **Pop**: * Pros: + More intuitive for removing the last element. + Less memory allocation overhead compared to `slice()`. * Cons: + Returns a value (the removed element), which might be unwanted in some scenarios. + Can lead to unexpected side effects if not used carefully. 2. **Slice**: * Pros: + More flexible, as it creates a new array without modifying the original one. + Does not return a value, making it safer to use. * Cons: + Requires more memory allocation and processing power compared to `pop()`. + Can be slower due to the overhead of creating a new array. **Library Usage** There is no explicit library usage mentioned in the benchmark definition. However, some JavaScript engines might provide additional optimizations or features that could affect the performance of these methods. **Special JS Feature/Syntax** None are explicitly mentioned. If any special features or syntax were used, it would be interesting to explore how they impact the benchmark results. However, based on the provided code and options, we can focus on the standard JavaScript methods `pop()` and `slice()`. **Other Alternatives** For large arrays, you might consider using: 1. **Array.prototype.indexOf()` or `Array.prototype.findIndex()` for finding a specific element, followed by slicing or removing that element. 2. **Array.prototype.splice()` to replace an element at a specified index. Keep in mind that these alternatives might not provide identical performance characteristics as the original methods. **Notes** The benchmark results provided are from Firefox 130 on a Linux desktop, with execution counts per second for each test case. This data will help identify which method is faster and more efficient for specific use cases.
Related benchmarks:
Array Slice vs Pop
Slice vs Pop vs At(-1)
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Last element slice vs pop
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