Benchmark: trim test_ceeres

Script Preparation code:

var str = "      42"

Tests:

Trim
str.trimStart()
indexOf
str.lastIndexOf(" ")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Trim
indexOf

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark, where users can create and run tests to measure the performance of specific code snippets. The "Name" field specifies that this is a test case for trimming whitespace from a string using the `trimStart()` method.

**Script Preparation Code**

The "Script Preparation Code" section provides an initial value for the variable `str`, which will be used as input for the benchmarking tests. In this case, it's set to `"      42"`, containing multiple whitespace characters at the beginning of the string.

**Html Preparation Code**

There is no HTML preparation code provided, which means that the benchmarking tests are isolated and do not depend on any external HTML context.

**Individual Test Cases**

The test cases are defined in a separate section of the JSON data. There are two test cases:

1. **Trim**: This test case measures the performance of the `str.trimStart()` method.
2. **indexOf**: This test case measures the performance of the `str.lastIndexOf(" ")` method.

**Library and Purpose**

In this benchmark, the `trimStart()` method is used to trim whitespace from the beginning of a string. The `lastIndexOf()` method is used to find the index of the last occurrence of a substring (`" "`) in the input string.

The `trimStart()` method is a part of the JavaScript String prototype and is used to remove whitespace characters from the beginning of a string.

**Special JS Features or Syntax**

There are no special JS features or syntax mentioned in this benchmark. The tests only utilize standard JavaScript methods and variables.

**Other Alternatives**

Other alternatives for trimming whitespace from a string could be:

* `str.replace(/^ +/g, '')`: This method uses regular expressions to replace one or more whitespace characters at the beginning of the string with an empty string.
* `str.substring(str.indexOf(' '))`: This method finds the index of the first whitespace character in the string and then returns a new substring starting from that index.

However, it's worth noting that these alternatives may have different performance characteristics compared to the `trimStart()` method used in this benchmark.

**Pros and Cons**

Here are some pros and cons of using each approach:

* **`trimStart()`**: Pros: Simple and efficient. Cons: May not work as expected for non-ASCII characters.
* `str.replace(/^ +/g, '')`: Pros: Works with any whitespace character. Cons: May be slower than `trimStart()` due to regular expression overhead.
* `str.substring(str.indexOf(' '))`: Pros: Works with any whitespace character. Cons: May be slower than `trimStart()` and more prone to errors.

Ultimately, the choice of approach depends on the specific requirements of your project and the trade-offs you're willing to make between performance, simplicity, and robustness.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:92.0) Gecko/20100101 Firefox/92.0

Browser/OS: Firefox 92 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Trim	34762576.0 Ops/sec
indexOf	51386140.0 Ops/sec

Related benchmarks:

trim test_ceeres (version: 0)

Comparing performance of: Trim vs indexOf

Created: 3 years ago by: Guest

Jump to the latest result

Trim

indexOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):