Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
split/join vs loop
(version: 0)
Comparing performance of:
split vs loop
Created:
7 years ago
by:
Guest
Jump to the latest result
Tests:
split
'abcdefghijklmnopqrstuvwxyz'.split().reverse().join('')
loop
let s = 'abcdefghijklmnopqrstuvwxyz'; let r = ''; for (let i = s.length -1; i >=0; i--) { r+=s[i] }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
split
loop
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON data and explain what's being tested, compared, and considered in the benchmark. **Benchmark Definition** The benchmark is testing two approaches to achieve the same result: reversing a string. There are three options compared: 1. **split().reverse().join('')**: This approach uses the `split()` method to split the string into an array of individual characters, reverses the array using the `reverse()` method, and then joins the characters back together into a single string using the `join()` method. 2. **loop**: This approach uses a traditional loop to iterate through the characters of the string in reverse order, concatenating each character to a result string. **Pros and Cons** * **split().reverse().join('')**: + Pros: concise and efficient, as it leverages built-in JavaScript methods. + Cons: may be slower due to method call overhead and potential caching issues (although this is unlikely in modern browsers). * **loop**: + Pros: straightforward and easy to understand, with no method call overhead. + Cons: more verbose and potentially slower due to the explicit iteration. **Library Usage** None of the test cases use any external libraries. **Special JS Feature or Syntax** The benchmark uses a feature called "Rest Parameter" in the `for...of` loop syntax for iteration. This is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). However, since this is a benchmark that focuses on performance and may not be running in all browsers, I won't delve deeper into its specifics. **Other Considerations** * **Cache Busting**: The test cases use different string literals (`'abcdefghijklmnopqrstuvwxyz'.split().reverse().join('')` vs. `let s = 'abcdefghijklmnopqrstuvwxyz'; let r = ''; for (let i = s.length -1; i >=0; i--) { r+=s[i] }`) to avoid caching issues, which could affect the benchmark results. * **JavaScript Engine**: The test is run on Firefox 103, but other JavaScript engines like V8 (used by Chrome) or SpiderMonkey (used by Netscape Navigator) may behave differently. **Alternatives** To run this benchmark on different platforms or browsers, you can modify the `Browser` and `DevicePlatform` fields in the JSON data to target specific environments. Additionally, if you want to compare the performance of these approaches using a different JavaScript engine or version, you would need to adjust the test case string literals accordingly. Keep in mind that running benchmarks on multiple platforms and browsers is a complex task, requiring careful consideration of factors like caching, method call overhead, and browser-specific optimizations. MeasureThat.net provides a valuable service by offering pre-configured benchmark tests for popular JavaScript engines.
Related benchmarks:
String concatenation vs array join vs array reduce
spread vs concat vs unshift (fair) to join arrays
Spread vs concat vs unshift (fair) to join arrays test
String concatenation vs array join (w/ input)
String concatenation vs array join (w/ input) fixed
Comments
Confirm delete:
Do you really want to delete benchmark?