Benchmark: remove last char2

Tests:

replace
var text = 'Hallo Welt 1234'; text.replace(/(\s+)?.$/, '');
split array
var text = 'Hallo Welt 1234'; text.slice(0, -1);
substring
var text = 'Hallo Welt 1234'; text.substring(0, text.length - 1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace
split array
substring

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition**

The `remove last char2` benchmark definition represents a simple JavaScript function that takes a string as input and returns the original string with the last character removed, except for the second-to-last character. The script preparation code is empty, indicating that no additional setup or initialization is required before running the test.

**Options Compared**

In this benchmark, three different approaches are being compared:

1. `replace`: Uses the `replace()` method to remove the last character from the string.
2. `split array`: Uses the `slice()` or `substring()` methods to split the string into two parts at the second-to-last index and returns the first part of the resulting array.
3. The third approach is not explicitly defined, so we'll assume it's another method that might be used to remove the last character (we won't cover this one).

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

1. `replace()`:
	* Pros: Simple and efficient.
	* Cons: Might not be as readable or maintainable as other approaches, especially for more complex patterns.
2. `split array`:
	* Pros: Can handle more complex cases, like removing characters based on a pattern or index.
	* Cons: Might be slower than the `replace()` method due to the overhead of creating and manipulating arrays.

**Library Used**

In this benchmark, none of the test cases explicitly use any external libraries. However, some browsers might include libraries or built-in functionality that could influence the results (e.g., Chrome's `String.prototype.replace()` implementation).

**Special JS Features/Syntax**

None of the test cases specifically utilize special JavaScript features like async/await, generators, or es6+ classes. If you wanted to write a benchmark for one of these features, it would require modifying the script preparation code accordingly.

**Alternative Approaches**

Other methods that could be used to remove the last character from a string include:

1. Using `toString().slice()`: This method is similar to `split array` but uses the `toString()` method to convert the string to a primitive value before slicing.
2. Using `replace()` with a callback function: This approach would allow for more complex character removal logic, like removing specific characters based on conditions.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your use case.

**Benchmark Preparation Code**

The benchmark preparation code is empty, which means no additional setup or initialization is required before running the test. This allows the focus to be solely on measuring the performance of each approach.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36

Browser/OS: Chrome 87 on Mac OS X 11.0.1

View result in a separate tab

Test name	Executions per second
replace	3339522.5 Ops/sec
split array	458846560.0 Ops/sec
substring	555152512.0 Ops/sec

Related benchmarks:

remove last char2 (version: 0)

Comparing performance of: replace vs split array vs substring

Created: 3 years ago by: Guest

Jump to the latest result

replace

split array

substring

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):