Benchmark: Regex vs LOop - MeasureThat.net

HTML Preparation code:

var componentName = "dc_monitor";

Script Preparation code:

var componentName = "dc_monitor";

Tests:

For loop
function isValidComponent(component) { if (typeof component === "string" && component.length > 2 && component.length < 10) { // component should contain only letters for (const char of component) { if (char < "a" || char > "z") { return false } } return true; } return false; } let isValid = isValidComponent(componentName);
Regex
function isValidComponent(component) { return component.length > 2 && component.length < 10 && /^[a-z]+$/.test(component); } let isValid = isValidComponent(componentName);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For loop
Regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Linux

View result in a separate tab

Test name	Executions per second
For loop	27280282.0 Ops/sec
Regex	24517528.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing two approaches to validate a string component in JavaScript: using a `for` loop and using regular expressions (Regex).

**Script Preparation Code**

The script preparation code defines a variable `componentName` with the value "dc_monitor". This variable will be used throughout the benchmark to represent the input component.

**Html Preparation Code**

Similar to the Script Preparation Code, the Html Preparation Code also defines the `componentName` variable. However, it's not clear why this is necessary, as it doesn't affect the logic of the benchmark.

**Individual Test Cases**

There are two test cases:

1. **For loop**: This test case uses a traditional `for` loop to iterate over each character in the input string and checks if it's within the allowed range (letters between 'a' and 'z'). If any character fails this check, the function returns `false`.
2. **Regex**: This test case uses regular expressions to achieve the same validation as the `For loop` approach. The regex pattern `/^[a-z]+$/` matches only strings containing letters between 'a' and 'z', effectively doing the same validation as the `for` loop.

**Pros and Cons of Each Approach**

1. **For loop**:
	* Pros: Easy to understand, readable code.
	* Cons: May be slower due to iteration, can be less efficient for large input strings.
2. **Regex**:
	* Pros: Can be faster and more efficient for large input strings, concise code.
	* Cons: Less readable for non-regex experts, may have performance overhead due to the complexity of regex engines.

**Library/Functionality Used**

In this benchmark, there is no explicit library or functionality being tested. However, regular expressions are a built-in JavaScript feature that uses a library-like implementation under the hood.

**Special JS Feature/Syntax**

There doesn't seem to be any special JavaScript features or syntax being used in this benchmark beyond what's already mentioned (Regex).

Related benchmarks:

Regex vs LOop (version: 0)

Comparing performance of: For loop vs Regex

Created: one year ago by: Guest

Jump to the latest result

For loop

Regex

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):