Benchmark: Regex removing single whitespace vs multiple whitespaces

Script Preparation code:

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

Tests:

regex
string.replace(/^\s+/g, '')
trim
string.replace(/^\s/g, '')

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: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Browser/OS: Chrome 86 on Linux

View result in a separate tab

Test name	Executions per second
regex	4508473.0 Ops/sec
trim	4662040.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Description**

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

1. Using regular expressions (`/^\\s+/g` or `/^\\s/g`) to replace one or multiple whitespace characters with an empty string.
2. Using the `trim()` method, which removes whitespace characters from both ends of a string.

**Options Compared**

Two options are being compared:

1. **Regex approach**: This approach uses regular expressions to match one or more whitespace characters (`\\s+`) at the beginning of the string (`^`), and then replaces them with an empty string.
2. **Trim method approach**: This approach uses the `trim()` method, which removes whitespace characters from both ends of the string.

**Pros and Cons**

**Regex approach:**

Pros:

* More flexible and powerful for complex whitespace removal scenarios
* Can be used to remove other types of whitespace characters (e.g., tabs, newline characters)

Cons:

* May have performance overhead due to regular expression engine processing
* Can be slower than the `trim()` method if not optimized

**Trim method approach:**

Pros:

* Faster and more efficient for simple whitespace removal scenarios
* Less resource-intensive than regular expressions

Cons:

* Limited flexibility and power compared to regex
* May not work correctly with certain types of whitespace characters or edge cases

**Library Used (if applicable)**

In this benchmark, no specific libraries are used beyond the standard JavaScript `trim()` method.

**Special JS Features/Syntax**

None mentioned in this explanation. However, if you're interested in learning about other features or syntax, I can explain them, but it would require more context and information about the specific feature or syntax being referred to.

**Other Alternatives**

If you want to remove whitespace from a string in JavaScript, there are other approaches beyond these two options:

1. **Using `replace()` method**: Similar to the regex approach, but without regular expressions.
2. **Using `split()` and `join()` methods**: Splitting the string into an array of substrings using whitespace as the separator, and then joining them back together.

These alternatives may have different performance characteristics or trade-offs compared to the options being tested in this benchmark.

Related benchmarks:

Regex removing single whitespace vs multiple whitespaces (version: 0)

testing removing all whitespaces whether by matching one space or multiple space at a time

Comparing performance of: regex vs trim

Created: 4 years ago by: Guest

Jump to the latest result

regex

trim

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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