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Pop vs shift
(version: 0)
Benchmark.js
Comparing performance of:
Pop vs shift
Created:
6 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var items = []; for(var i=0;i<1000000;i++) items.push({id:i,key:'val'});
Tests:
Pop
while(items.length) { items.pop(); }
shift
while(items.length) { items.shift(); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Pop
shift
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36
Browser/OS:
Chrome 133 on Windows
View result in a separate tab
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=589425" width="100%" height="500px"></iframe>
shift
175.2M/s
Pop
171.7M/s
View exact numbers
Test name
Executions per second
✓
shift
175,174,000 Ops/sec
Pop
171,699,616 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases to understand what's being tested. **Benchmark Definition:** The benchmark definition is a simple JavaScript function that repeatedly removes elements from an array using two different approaches: `pop()` and `shift()`. The script preparation code initializes an empty array `items` with 1,000,000 elements, each containing an `id` property. The HTML preparation code is not provided. **Test Cases:** There are only two test cases: 1. **Pop**: This test case repeatedly removes the last element from the `items` array using the `pop()` method. 2. **Shift**: This test case repeatedly removes the first element from the `items` array using the `shift()` method. **What's being tested:** The benchmark is testing the performance of these two methods (`pop()` and `shift()`) in a controlled environment. The results will show which method is faster for removing elements from an array. **Options compared:** * **Pop**: Removes the last element from the array using `items.pop()`. * **Shift**: Removes the first element from the array using `items.shift()`. **Pros and Cons of each approach:** * **Pop**: + Pros: - Faster for removing elements from the end of an array (since it doesn't need to shift all elements). - More intuitive for some developers. + Cons: - Can be slower for removing elements from the beginning of an array (since it needs to shift all elements). * **Shift**: + Pros: - Faster for removing elements from the beginning of an array. - More efficient when dealing with large arrays. + Cons: - Slower for removing elements from the end of an array. **Library usage:** There is no explicit library used in this benchmark. However, JavaScript arrays are a built-in data structure provided by the ECMAScript standard. **Special JS features or syntax:** There are no special JavaScript features or syntax used in this benchmark. It's a straightforward example of using `pop()` and `shift()` methods on an array. **Other alternatives:** Other alternatives to `pop()` and `shift()` include: * Using `splice()` with an offset of 0 and a length of 1 to remove the first element. * Using `slice()` to extract the first element from the array, then using `push()` or `unshift()` to add elements at the beginning or end of the array. However, for simple array manipulation tasks like this benchmark, `pop()` and `shift()` are usually sufficient and most efficient options.
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