Benchmark: Split join vs replace long string long string

Script Preparation code:

var example = `Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin id ligula in ligula elementum varius. Pellentesque consectetur, enim eu scelerisque viverra, lacus ligula convallis lectus, ac aliquet erat mi sit amet mauris. Aliquam vehicula diam lectus, id faucibus diam consectetur et. Fusce quis justo imperdiet, viverra orci nec, imperdiet dolor. Praesent a sem facilisis, euismod sapien at, eleifend tellus. Cras lacinia nisi eu luctus volutpat. Quisque semper sed mauris tincidunt viverra. In hac habitasse platea dictumst. Donec aliquet mattis aliquam. Curabitur non eleifend urna, ac iaculis lorem. Quisque in viverra dui, ut laoreet arcu. Sed finibus tortor in turpis sollicitudin, nec egestas odio gravida.

Ut imperdiet tellus non congue rhoncus.Integer posuere gravida leo a fermentum.Praesent tincidunt porttitor sapien vel tempor.Praesent elit neque, dignissim elementum mauris vitae, semper aliquet nisl.Aliquam id mi id lacus accumsan feugiat.Integer sit amet vestibulum mauris.Donec sodales fringilla leo, vel venenatis elit aliquam non.Vestibulum molestie orci non leo cursus, eu rutrum risus vulputate.Mauris lobortis eget metus sed gravida.Pellentesque feugiat turpis in ligula rutrum, ut pulvinar libero congue.Fusce a eros ligula.

Aliquam sodales facilisis facilisis.In ultrices purus vitae lectus pharetra posuere vitae quis mi.Phasellus magna risus, ultrices a luctus nec, mattis et nibh.Nullam et eros lectus.Aenean sed tincidunt eros.Aenean pretium lorem vel nunc consectetur, non eleifend libero porttitor.Aliquam sed nibh rhoncus, ullamcorper augue nec, sodales nisl.

Cras venenatis auctor risus, id faucibus libero gravida id.Sed laoreet pretium nulla in tincidunt.Phasellus ipsum nulla, tincidunt id magna quis, vehicula interdum odio.Quisque a leo id felis placerat convallis sed et est.Suspendisse quis enim at nisi dignissim tincidunt.Pellentesque sed imperdiet lectus.In nec velit vitae erat molestie egestas vel vitae felis.In a mollis ligula.Etiam mauris ex, faucibus a aliquam ut, iaculis in tellus.Cras venenatis orci eget metus fermentum pulvinar.Curabitur odio est, tristique sit amet sem nec, dictum convallis orci.Donec mollis nulla non metus varius, nec porttitor ipsum luctus.Curabitur condimentum nisl vel dolor facilisis, vitae ultrices quam convallis.Vestibulum finibus fringilla ex, sit amet lobortis mauris efficitur ut.Donec vehicula metus nec metus finibus maximus.

Nam ullamcorper, justo ac interdum ornare, erat ipsum ornare sapien, eu viverra nunc libero nec ipsum.Nullam laoreet mauris in tellus tincidunt, sed tempus arcu scelerisque.Mauris quis posuere dolor.In in suscipit diam.Praesent rhoncus est id dui dapibus, a interdum felis malesuada.Mauris dapibus est eget nibh congue porttitor eget quis mauris.Cras blandit enim vitae elit cursus accumsan.Duis egestas ipsum aliquam lacus mollis, imperdiet egestas nisi euismod.Nam tincidunt nulla et purus elementum dictum non quis mi.Sed tempus porttitor erat, nec dapibus est euismod sit amet.

Sed auctor lacinia eros quis maximus.Aliquam id auctor dui, convallis rutrum neque.Duis venenatis vel ante vitae placerat.Cras sit amet elit a magna egestas volutpat.In hac habitasse platea dictumst.Morbi ut rhoncus ex, vitae euismod lorem.Nulla facilisi.Vivamus ut ultricies dui, non convallis urna.Curabitur aliquet ipsum sapien, eu porta ante laoreet in .

Maecenas congue molestie ex.Cras volutpat erat vestibulum posuere lacinia.Nulla facilisi.Aenean eget consequat massa.Sed suscipit mi vitae tortor gravida, non laoreet massa hendrerit.Sed euismod commodo consectetur.Proin laoreet pharetra magna, sit amet scelerisque arcu tristique at.Nunc erat nibh, facilisis in dignissim vel, sollicitudin a nisi.

Vivamus et ante accumsan, bibendum tortor ac, vestibulum orci.Aliquam urna est, pulvinar sit amet tincidunt non, rhoncus vel justo.Maecenas nec arcu in felis tristique scelerisque ut at dolor.Nullam pretium purus ut massa accumsan rutrum.Pellentesque molestie turpis a vestibulum efficitur.Mauris ultricies orci vitae ipsum lobortis euismod et ut tortor.Integer tellus eros, bibendum scelerisque mattis vulputate, tempus vel sapien.Phasellus varius est nisi, at rhoncus massa semper in .Pellentesque consectetur leo risus, eget consectetur nulla hendrerit sed.Sed aliquam neque id ante elementum convallis.Suspendisse potenti.Sed feugiat pharetra enim, in bibendum diam pulvinar eget.

Duis eu venenatis nulla.Fusce vehicula odio eu arcu eleifend, ac dictum enim malesuada.Vivamus placerat fringilla nunc, id scelerisque sapien tempor in .Proin id lorem quam.Donec in vehicula ligula.Praesent ac massa vehicula, efficitur erat eu, elementum magna.Ut euismod pretium sodales.Nunc aliquam porttitor elit in suscipit.Sed vel imperdiet augue.Curabitur vitae leo nisl.Nullam vitae ornare sem.Sed venenatis massa quis nunc cursus, in pharetra lectus molestie.

Pellentesque mollis sem lacinia nisl malesuada tincidunt.Maecenas sapien eros, blandit ut nisi non, finibus ultricies nisi.Praesent faucibus facilisis lorem quis eleifend.Donec consequat nec odio mattis dictum.Praesent id tempus arcu.Morbi semper fermentum dolor, sed tempor massa maximus nec.Mauris lobortis est odio, et tempor libero scelerisque ut.Nulla vehicula non nibh euismod dictum.Donec dapibus enim id ipsum gravida porttitor.Aliquam erat volutpat.Vivamus vestibulum, libero at suscipit vulputate, ipsum velit pulvinar ex, volutpat aliquam elit felis eget nibh.`

Tests:

split + join
var result = example.split(/(?=[A-Z])/).join(' ');
replace
var result = example.replace(/([A-Z]+)/g, ' $1')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split + join
replace

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

A technical question!

Based on the provided information, I'll provide an answer.

The example code seems to be written in JavaScript. The first part of the code snippet is a string `example` with a special character `/(?=[A-Z])/`, which suggests it's intended for use with regular expressions (regex).

To fix the errors, we need to:

1. Replace `example.split(/(?=[A-Z])/).join(' ')` with `example.split(/[A-Z]/).join(' ')`. The regex pattern `/[^A-Za-z0-9]+/g` matches one or more characters that are not letters or numbers, and the `s` flag at the end makes it case-insensitive. This will ensure that spaces between words are preserved.
2. Replace `example.replace(/([A-Z]+)/g, ' $1')` with `example.replace(/\b[A-Z]\b/g, ' $&')`. The regex pattern `\b` matches word boundaries, and `$&` refers to the matched group (the uppercase letter). This will ensure that spaces are preserved between words.

Here is the corrected code:
```javascript
var result1 = example.split(/[A-Z]/).join(' ');
var result2 = example.replace(/\b[A-Z]\b/g, ' $&');
```
Note: The original `replace` function seems to be using a custom replacement pattern `'$1'`, which is not standard. I've replaced it with the standard `$&` syntax, which refers to the matched group (the uppercase letter).

Please let me know if this solves your problem!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36 Edg/113.0.1774.42

Browser/OS: Chrome 113 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
split + join	15263.9 Ops/sec
replace	43212.6 Ops/sec

Related benchmarks:

Split join vs replace long string long string (version: 0)

Comparing performance of: split + join vs replace

Created: one year ago by: Guest

Jump to the latest result

split + join

replace

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):