Benchmark: trim + length VS regex

Script Preparation code:

var str = "  abc";

Tests:

trim + length
str.trim().length > 2
regex test
/\S{3,}/.test(str)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
trim + length
regex test

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 on MeasureThat.net.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which outlines the testing scenario and expectations. In this case, we have two test cases:

1. `trim + length VS regex`: This is the main benchmarking question. It asks whether the input string contains at least 3 non-whitespace characters in sequence.
2. Two sub-test cases:
	* `trim + length`
	* `regex test`

The script preparation code and HTML preparation code are empty, indicating that no specific setup or configuration is required for this benchmark.

**Test Cases**

Let's examine each test case:

1. **`trim + length`**:
This test case checks the performance of using `str.trim().length > 2` to determine if the input string has at least 3 non-whitespace characters in sequence.
Pros: Simple and straightforward, leveraging built-in JavaScript methods.
Cons: May be slower due to method call overhead.

2. **`regex test`**:
This test case uses a regular expression (`/\\S{3,}/.test(str)`) to achieve the same goal as the first test case. The `\S` character class matches any non-whitespace character, and `{3,}` specifies that at least 3 of these characters must be present.

Pros: Can be faster due to the optimized nature of regular expressions.
Cons: May require additional setup or configuration for some browsers.

**Libraries and Features**

The benchmark does not explicitly use a specific JavaScript library. However, it relies on built-in functions like `trim()` and regular expression matching (`/\\S{3,}/.test(str)`).

If the test case used special JS features or syntax, they would be described here. Since none are mentioned in this example, we'll move on.

**Other Alternatives**

Some alternative approaches to measuring performance for similar use cases could include:

1. Using a regex engine like `String.prototype.match()` with a similar pattern.
2. Leveraging more advanced string manipulation techniques, such as using `String.prototype.replace()` or `String.prototype.indexOf()`.
3. Employing caching or memoization strategies to reduce the number of operations performed.
4. Comparing performance across different JavaScript engines (e.g., V8, SpiderMonkey) using a similar benchmark.

Keep in mind that these alternatives might not be directly applicable to this specific benchmark definition and test cases.

Related benchmarks:

trim + length VS regex (version: 0)

"does the input contain at least 3 non whitespace characters in sequence?"

Comparing performance of: trim + length vs regex test

Created: 4 years ago by: Guest

Jump to the latest result

trim + length

regex test

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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