Benchmark: Check for empty string (only whitespaces)

Script Preparation code:

var str = ' \n\t  hello world \n\n';
var regex = /$\s*$/;

Tests:

.trim()
str.trim().length === 0
regex
regex.test(str)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
.trim()
regex

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; rv:71.0) Gecko/20100101 Firefox/71.0

Browser/OS: Firefox 71 on Linux

View result in a separate tab

Test name	Executions per second
.trim()	14192795.0 Ops/sec
regex	22727408.0 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 its test cases.

**Benchmark Overview**

The benchmark is designed to measure the performance of JavaScript strings, specifically focusing on two aspects: string trimming and regular expression testing. The benchmark provides a prepared script and HTML code that can be used to create a simple web page for running the tests.

**Test Cases**

There are two test cases in this benchmark:

1. **`.trim()`**: This test case checks the length of the trimmed string. The idea is to measure how fast JavaScript engines can trim an empty string by removing leading and trailing whitespaces.
2. **`regex.test(str)`**: This test case tests the regular expression `/$\\s*$/` on a given string. The regular expression attempts to match any whitespace character at the end of the string.

**Options Compared**

In this benchmark, two main options are compared:

1. **`.trim()`**: A built-in JavaScript method for removing leading and trailing whitespaces from a string.
2. **Regular Expression (`regex`)**: A string pattern used to test if a specific regular expression matches the given string.

**Pros and Cons of Each Approach**

**`.trim()`**:

Pros:

* Simple and straightforward
* Works well for empty strings with only whitespace characters
* Built-in JavaScript method, so it's widely supported

Cons:

* May not work as expected on non-ASCII strings (e.g., Unicode characters)
* Can be slower than regular expression testing for longer strings

**Regular Expression (`regex`)**:

Pros:

* Flexible and can handle more complex string patterns
* Works well with non-ASCII strings and Unicode characters
* Can be faster than `.trim()` for longer strings due to optimized engine implementation

Cons:

* More verbose and harder to read, especially for complex patterns
* May have performance issues on older browsers or engines that don't support the regular expression engine

**Library Usage**

In this benchmark, a library is used to create a simple web page for running the tests. However, no specific JavaScript library is mentioned in the provided information.

**Special JS Features/Syntax**

None of the test cases explicitly use any special JavaScript features or syntax. The tests focus on basic string manipulation and regular expression testing.

**Other Alternatives**

If you want to create similar benchmarks, consider using other popular testing frameworks or libraries for JavaScript, such as:

* Jest
* Mocha
* Chai
* Cypress

Keep in mind that these alternatives might have different strengths and weaknesses compared to MeasureThat.net's approach.

Related benchmarks:

Check for empty string (only whitespaces) (version: 0)

Comparing performance of: .trim() vs regex

Created: 4 years ago by: Registered User

Jump to the latest result

.trim()

regex

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):