Benchmark: Replace using a string VS regex

Tests:

Replace string
'2023-07-01T12:00:00.000 0100'.replace(' ','+')
Replace regex
'2023-07-01T12:00:00.000 0100'.replace(/ /g, '+')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Replace string
Replace regex

Fastest: N/A

Slowest: N/A

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/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Replace string	37221324.0 Ops/sec
Replace regex	20980494.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

MeasureThat.net is testing two different approaches to replace a space character in a string: using a regular expression (regex) and using a simple string replacement method.

**Options compared:**

There are two main options being compared:

1. **Using `replace()` with a string**: This involves calling the `replace()` method on the string, passing in the characters to be replaced (`' '`) as the first argument, and the replacement string (`'+'`) as the second argument.
2. **Using `replace()` with regex**: This involves calling the `replace()` method on the string, passing in a regex pattern (`/ /g`) that matches one or more whitespace characters, and the replacement string (`'+'`) as the third argument.

**Pros and Cons of each approach:**

1. **Using `replace()` with a string**:
	* Pros: Simple, easy to read, and understand.
	* Cons: May be slower than regex for larger strings or complex replacements.
2. **Using `replace()` with regex**:
	* Pros: Can handle more complex replacements, such as replacing multiple characters at once or using anchors to match from the start or end of the string.
	* Cons: May be less readable and understand for those not familiar with regex.

**Library and purpose (if applicable):**

In this case, there is no specific library being used. The `replace()` method is a built-in JavaScript function that can handle both string and regex replacements.

**Special JS feature or syntax:**

There are no special JavaScript features or syntaxes being used in this benchmark.

**Other alternatives:**

While not explicitly mentioned in the benchmark definition, other alternatives for replacing strings could include:

* Using `split()` and `join()` methods to split the string into an array of substrings and then join them back together with the replacement characters.
* Using a regular expression with capturing groups to extract the replacement characters from the input string.

**Benchmark preparation code:**

The script preparation code is not provided, but it's likely that the benchmark script contains the JavaScript code being tested, as well as any necessary setup or configuration for the test environment.

Overall, this benchmark provides a simple and straightforward way to compare the performance of two different approaches to replacing strings in JavaScript.

Related benchmarks:

Replace using a string VS regex (version: 0)

Comparing performance of: Replace string vs Replace regex

Created: 2 years ago by: Guest

Jump to the latest result

Replace string

Replace regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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