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

Latest run results:

Run details: (Test run date: 2 years 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

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

Related benchmarks:

startsWith speed (version: 0)

Comparing performance of: startsWith vs !=

Created: 2 years ago by: Guest

Jump to the latest result

startsWith

!=

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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