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pop vs length 123456 22
(version: 0)
Benchmark.js
asd asd asd asd asd
Comparing performance of:
length vs pop
Created:
4 years ago
by:
Guest
Go to the latest result
Tests:
length
const data = [1, 2, 3, 4]; return data[data.lenth - 1];
pop
const data = [1, 2, 3, 4]; return data.pop();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
length
pop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser/OS:
Chrome 122 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=512985" width="100%" height="500px"></iframe>
pop
27.9M/s
length
17.1M/s
View exact numbers
Test name
Executions per second
✓
pop
27,939,792 Ops/sec
length
17,122,492 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested on the provided JSON. **Benchmark Definition**: The main goal of this benchmark is to compare the performance of two different ways to access the last element in an array: using `length` and `pop()` methods. **Options compared**: 1. **Using `data.length - 1`**: This approach involves accessing the last index of the array using the `length` property, subtracting 1 from it, and then indexing into the array with that value. 2. **Using `data.pop()`**: This approach uses the `pop()` method to remove and return the last element from the array. **Pros and Cons**: * **Using `data.length - 1`**: + Pros: Generally faster and more efficient, as it avoids the overhead of calling a method and modifying the array. + Cons: May be less intuitive for developers who are not familiar with this approach. * **Using `data.pop()`**: + Pros: More intuitive and easier to understand, especially for those who are used to working with arrays in JavaScript. + Cons: Generally slower due to the overhead of calling a method and modifying the array. In general, using `data.length - 1` is a good choice when you need to access the last element of an array quickly and efficiently. However, if readability is more important than performance, `data.pop()` may be a better option. **Other considerations**: * Both approaches assume that the input array has at least one element. * If the array can be empty or null, additional checks would need to be added to prevent errors. **Library usage**: None of the provided benchmark definitions uses any external libraries. **Special JavaScript features or syntax**: There are no special JavaScript features or syntax mentioned in these benchmarks. The code is standard JavaScript and only involves basic array operations. Now, let's take a look at some other alternatives that could be used to measure the performance of accessing the last element of an array: * Using `Array.prototype.at(-1)` (ES2019+): This method returns the last element of an array. It's generally faster than using `length - 1` and more readable than `pop()`. * Using a custom loop: Instead of using one of these built-in methods, you could write a simple loop to iterate through the array and return the last element. This approach would be slower than the others but could be interesting for educational purposes. * Measuring other methods: Depending on your specific use case, you might want to benchmark other ways of accessing the last element of an array, such as using `indexOf(-1)` or `slice().at(-1)`.
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