Benchmark: lastIndexOf + slice vs split + slice

Tests:

1
function removeFileNameInPath(path) { const splitedPath = path.split('\\'); const resultPath = splitedPath.slice(0, splitedPath.length - 1).join('\\'); return resultPath; }; const test = removeFileNameInPath("C:\\test\\testbook\\testIncident\\iamorage\\test.exe")
2
function removeFileNameInPath(path) { const lastIndex = path.lastIndexOf('\\'); if (lastIndex !== -1) { return path.slice(0, lastIndex); } else { return path; } }; const test2 = removeFileNameInPath("C:\\test\\testbook\\testIncident\\iamorage\\test.exe")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Windows

View result in a separate tab

Test name	Executions per second
1	8782190.0 Ops/sec
2	43406012.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is tested on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a simple JavaScript function that takes a file path as input and returns the path without the file name. The function has two versions:

1. `removeFileNameInPath` (Version 1): uses `split()` and `slice()` to remove the file name.
2. `removeFileNameInPath` (Version 2): uses `lastIndexOf()` and `slice()` to remove the file name.

**Options Compared**

The benchmark is comparing two approaches:

1. **Using `split()` and `slice()`**: This approach splits the path into an array of substrings using `split()`, and then uses `slice()` to extract the first element, which excludes the file name.
2. **Using `lastIndexOf()` and `slice()`**: This approach finds the index of the last occurrence of the file separator (`\\`) using `lastIndexOf()`, and then uses `slice()` to extract the substring up to that index.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Using `split()` and `slice()`**:
	* Pros: Simple, efficient, and widely supported.
	* Cons: May not be optimal for paths with multiple file separators or nested directories.
2. **Using `lastIndexOf()` and `slice()`**:
	* Pros: More flexible than the first approach, as it can handle different types of separators.
	* Cons: May have performance overhead due to the `lastIndexOf()` function.

**Library Used**

None of the provided benchmark definitions use a specific library. However, if we were to write similar code using popular JavaScript libraries, we might use the `path` module (built-in in Node.js) or a library like `js-Path`.

**Special JS Feature or Syntax**

There are no special JS features or syntax used in this benchmark.

Now, let's talk about other alternatives:

1. **Using regular expressions**: Instead of using `lastIndexOf()` and `slice()`, we could use regular expressions to match the file separator and extract the substring.
2. **Using `path.normalize()`**: If you're working with Node.js, you can use the `path.normalize()` function to normalize paths and remove the file name.
3. **Using a library like `js-Path`**: This library provides various functions for manipulating file paths, including removing file names.

In summary, the benchmark is comparing two approaches to remove the file name from a path: using `split()` and `slice()`, or using `lastIndexOf()` and `slice()`. The first approach is simple and efficient, while the second approach is more flexible but may have performance overhead.

Related benchmarks:

lastIndexOf + slice vs split + slice (version: 0)

lastIndexOf + slice vs split + slice

Comparing performance of: 1 vs 2

Created: 2 years ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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