Benchmark: startsWith speed

Script Preparation code:

var path = "/directory/subfolder";
var currentDirectory = "directory";
var currentPath = "/directory/subfolder2";

Tests:

startsWith
path.startsWith("/" + currentDirectory);
!=
path != currentPath

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
startsWith
!=

Fastest: N/A

Slowest: N/A

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.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark, specifically measuring the performance of `path.startsWith()` and `"!"` (not equal) operators in different browsers.

**Script Preparation Code**

Before running the test, the script prepares some variables:

```javascript
var path = "/directory/subfolder";
var currentDirectory = "directory";
var currentPath = "/directory/subfolder2";
```

These variables are likely set to specific values to isolate the performance of the operators being tested. The `path` variable is used as a string that starts with a certain directory, while the `currentDirectory` and `currentPath` variables provide different starting points for the comparison.

**Benchmark Definition**

The benchmark consists of two test cases:

1. `startsWith`: This test case uses the `path.startsWith()` function to check if the `path` variable starts with `/`. The expected result is likely a simple yes/no condition, but the actual implementation might be more complex.
2. `"!"`: This test case uses the `!=` operator to compare two strings. In this case, it's comparing the `path` variable with the `currentPath` variable.

**Comparison**

The comparison between `startsWith()` and `"!"` is likely to highlight performance differences in these two operators:

* `startsWith()`: This function might involve more complex string processing or regular expression matching, which could impact its performance.
* `"!"`: The equality check using the `!=` operator might be faster since it's a simple string comparison without any additional processing.

**Pros and Cons**

Here are some pros and cons for each approach:

* `startsWith()`:
	+ Pros: Might perform well if the regular expression engine is optimized for this specific use case.
	+ Cons: May involve more complex string processing, which can lead to slower performance.
* `"!"`: 
	+ Pros: A simple string comparison that might be faster due to its straightforward implementation.
	+ Cons: It's not as flexible as `startsWith()` since it only checks for inequality.

**Library and Special JS Features**

In this benchmark, there is no explicit library used. However, the use of the `"!"` operator suggests using a JavaScript interpreter or engine that supports string comparison (e.g., Firefox).

There are no special JavaScript features mentioned in this benchmark.

**Other Alternatives**

For measuring performance differences between `startsWith()` and `"!"`, you could consider other approaches:

* Measure the performance of different string comparison operators, such as `===`, `!==`, or `includes()`.
* Use a regex engine like RegExp to measure the performance of regular expression-based string comparisons.
* Compare the performance of different JavaScript implementations or engines.

In summary, this benchmark aims to compare the performance of `startsWith()` and `"!"` operators in different browsers. The test cases use specific variables to isolate the comparison, and the results are expected to highlight any performance differences between these two operations.

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser/OS: Firefox 121 on Windows

View result in a separate tab

Test name	Executions per second
startsWith	1324355328.0 Ops/sec
!=	1232930944.0 Ops/sec

Related benchmarks:

startsWith speed (version: 0)

Comparing performance of: startsWith vs !=

Created: 10 months ago by: Guest

Jump to the latest result

startsWith

!=

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):