Benchmark: Regex removing first whitespace vs trim

Script Preparation code:

var string = '    fsajdf asdfjosa fjoiawejf oawjfoei jaosdjfsdjfo sfjos 2324234 sdf safjao j o        sdlfks dflks l      '

Tests:

regex
string.replace(/^ */g, '')
trim
string.trim()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
trim

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/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
regex	17915904.0 Ops/sec
trim	27706838.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches for removing whitespace from a string:

1. **Regular Expression (Regex)**: Using the `string.replace()` method with a regular expression pattern that matches one or more whitespace characters (`^ */g`) and replaces them with an empty string.
2. **Trim**: Using the `string.trim()` method, which removes leading and trailing whitespace by default.

**Options Compared**

The benchmark is comparing two options:

* Option 1: Regex (using `string.replace()`)
* Option 2: Trim (using `string.trim()`)

**Pros and Cons of Each Approach**

**Regex**

Pros:

* Highly customizable: allows for fine-grained control over whitespace removal
* Can be used to remove other types of characters or patterns

Cons:

* Performance overhead due to regular expression parsing and execution
* May have security risks if not used carefully (e.g., using unescaped special characters)

**Trim**

Pros:

* Fast and efficient: `trim()` is a built-in method optimized for performance
* Simple and easy to use

Cons:

* Limited customization options: only removes leading and trailing whitespace by default

**Library Usage**

There is no library mentioned in the provided JSON data. However, it's worth noting that if the benchmark used a library like jQuery or another DOM manipulation library, it might have introduced additional dependencies or performance overhead.

**Special JavaScript Features/Syntax**

There are no special JavaScript features or syntax mentioned in the provided data.

**Other Alternatives**

If you wanted to compare other approaches for removing whitespace from a string, some alternatives could include:

* Using a custom implementation of `trim()` that allows for more customization options
* Using a regex alternative like `string.slice()` with a fixed length (e.g., `string.slice(1, -1)`)
* Using a different library or framework-specific method (if applicable)
* Using a testing framework's built-in string manipulation functions

Keep in mind that the benchmark results provided are specific to the Chrome browser and may not generalize well to other browsers or platforms.

Related benchmarks:

Regex removing first whitespace vs trim (version: 0)

testing removing beginning and end whitespace vs trim

Comparing performance of: regex vs trim

Created: 2 years ago by: Guest

Jump to the latest result

regex

trim

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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