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splice vs reduce
(version: 0)
Benchmark.js
Comparing performance of:
splice vs if
Created:
5 years ago
by:
Guest
Go to the latest result
Tests:
splice
var t = ['a', 'b', 'c', 'd']; var last = t.splice(-1) var result = t.map(el => `<span>{$el}</span>`).concat(last)
if
var t = ['a', 'b', 'c', 'd']; var result = t.map((el, index, list) => index < list.length - 1 ? `<span>${el}</span>` : el)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
splice
if
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Browser/OS:
Chrome 129 on Linux
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<iframe src="https://measurethat.net/Embed?id=558239" width="100%" height="500px"></iframe>
if
13.0M/s
splice
5.9M/s
View exact numbers
Test name
Executions per second
✓
if
13,014,545 Ops/sec
splice
5,920,596 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, the options compared, their pros and cons, and other considerations. **Benchmark Overview** The benchmark is designed to compare the performance of two JavaScript approaches: `splice` and `if` (with index checking). The test case uses a simple array manipulation example where elements are converted to HTML strings and concatenated. **Options Compared** There are two options compared in this benchmark: 1. **Splice**: This approach uses the `splice()` method to remove the last element from the array, and then concatenates the remaining elements with the removed element. 2. **If (with index checking)**: This approach uses a conditional statement to check if the current index is less than the length of the array minus one. If true, it converts the element to HTML and appends it to the result string. **Pros and Cons** Here are some pros and cons of each approach: * **Splice**: + Pros: Efficient removal of elements from an array. + Cons: May cause unnecessary reordering of elements in the array if not used carefully. * **If (with index checking)**: + Pros: More predictable and efficient iteration over the array, avoiding unnecessary reordering of elements. + Cons: Requires more memory allocation for the temporary result string. **Other Considerations** * Both approaches have a time complexity of O(n), where n is the length of the array. However, the `if` approach might be slightly faster due to its predictability and reduced overhead. * The benchmark uses Chrome 129 as the target browser, which may not represent all possible browsers or versions. **Library** The benchmark does not use any external libraries. It's a vanilla JavaScript implementation. **Special JS Feature/Syntax** There is no specific JavaScript feature or syntax being tested in this benchmark. However, it does utilize some ES6 features, such as arrow functions and template literals (e.g., `<span>{$el}</span>`). **Alternatives** Other approaches to achieve similar results might include: * Using `forEach()` instead of `map()`. * Implementing a custom loop using a `for`-loop or recursion. * Utilizing other array methods, such as `slice()` or `filter()`. Keep in mind that the choice of approach ultimately depends on the specific requirements and constraints of your use case.
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