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Split vs Substr+IndexOf Performance 2
(version: 0)
Benchmark.js
Comparing performance of:
Split vs Substring vs Substring 2
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var s1 = "28.9% CPU samples were in `Array.Sort` called from `DiagService.Controllers.PerfCPUController.CpuTask`. We expect this value to be less than 0.7%."
Tests:
Split
var resultSplit = s1.split[1];
Substring
var resultSubstr = s1.substring(s1.indexOf('`') + 1, s1.indexOf('`', s1.indexOf('`') + 1))
Substring 2
var i = s1.indexOf('`') + 1; var resultSubstr = s1.substring(i, s1.indexOf('`', i))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
Split
Substring
Substring 2
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Browser/OS:
Firefox 121 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=494603" width="100%" height="500px"></iframe>
Substring
26.4M/s
Substring 2
25.7M/s
Split
19.1M/s
View exact numbers
Test name
Executions per second
✓
Substring
26,423,322 Ops/sec
Substring 2
25,712,008 Ops/sec
Split
19,078,330 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested. **Benchmark Definition** The benchmark is testing three different approaches to extract a substring from a string: `split`, `substring` with `indexOf`, and another variant of `substring` that uses two consecutive calls to `indexOf`. Here are the options being compared: 1. **`split"`**: This method splits the input string into an array of substrings using whitespace as the delimiter. In this case, it's used to extract a single substring from the original string. 2. **`substring` with `indexOf"`**: This method extracts a portion of the string that starts at a specified index and has a specified length. In this case, it's used to extract a substring starting at the index immediately after the backtick (`) character. 3. **Variant 1: Two consecutive calls to `indexOf`** (used in "Substring 2"): This method extracts a portion of the string that starts at a specified index and has a length of 1, using two consecutive calls to `indexOf` to find the start and end indices. **Pros and Cons** * **`split"`**: Pros: simple, efficient. Cons: may not be the most efficient way to extract a single substring, as it creates an array of substrings. * **`substring` with `indexOf"`**: Pros: flexible, easy to use. Cons: may have performance issues if used incorrectly (e.g., if the index is incorrect or if the string contains many consecutive occurrences of the delimiter). * **Variant 1: Two consecutive calls to `indexOf`**: Pros: similar to `substring` with `indexOf`, but avoids creating an array of substrings. Cons: slightly more complex, may have performance issues if used incorrectly. **Library Usage** None of the benchmarked code snippets use any external libraries. **Special JavaScript Features or Syntax** None of the benchmarked code snippets use any special JavaScript features or syntax (e.g., async/await, Promises). **Other Alternatives** If you wanted to write a similar benchmark, here are some alternative approaches you could consider: 1. **Using a regular expression**: You could use a regular expression to extract the desired substring from the input string. 2. **Using `replace` method**: You could use the `replace` method to replace all occurrences of a pattern with an empty string and then take the resulting substring. 3. **Using a custom implementation**: You could write your own custom function to extract substrings using a different algorithm or data structure. Keep in mind that these alternatives may have different performance characteristics than the benchmarked code snippets, so you would need to adjust the benchmark accordingly.
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