Benchmark: index of - MeasureThat.net

Script Preparation code:

var a =  "AAA"

Tests:

aaa
a.indexOf("A");
bbb
a.indexOf("A");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
aaa
bbb

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark measures the performance of different approaches to finding an index in a string using the `indexOf()` method.

**Options Compared**

In this benchmark, two options are compared:

1. **Direct String Indexing**: This approach uses the `indexOf()` method directly on the string variable `a`.
2. **Preprocessed String**: The string is preprocessed by concatenating `aaa` or `bbb` to the original string, and then finding the index of the resulting string.

**Pros and Cons**

* **Direct String Indexing**:
	+ Pros: Simple and straightforward approach.
	+ Cons: May not be optimized for performance, especially for large strings.
* **Preprocessed String**:
	+ Pros: Can potentially improve performance by pre-processing the string before searching.
	+ Cons: Adds unnecessary complexity to the benchmark, and may not always result in better performance.

**Library Used**

There is no specific library mentioned in the provided JSON. However, it's worth noting that MeasureThat.net benchmarks often use JavaScript libraries like V8 (the open-source JavaScript engine used by Google Chrome) or SpiderMonkey (the JavaScript engine used by Mozilla Firefox) to measure performance.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax mentioned in the provided JSON. The benchmark uses standard JavaScript syntax and semantics.

**Other Alternatives**

Other alternatives for finding an index in a string might include:

* **Using regular expressions**: Instead of `indexOf()`, one could use a regular expression to search for the substring.
* **Using a loop**: A simple loop could be used to iterate over the characters in the string until the target substring is found.

These alternatives are not tested in this benchmark, but they might be interesting to explore in other contexts.

**Benchmark Preparation Code**

The provided `Script Preparation Code` is:
```javascript
var a = "AAA";
```
This sets up a simple string variable `a` containing the ASCII character 'A' repeated three times. The `Html Preparation Code` is empty, indicating that no additional HTML setup is required for this benchmark.

**Test Cases**

The two test cases are identical and measure the performance of finding an index in the string `a` using both approaches:

* **aaa**: Finds the index of `'A'` in the preprocessed string.
* **bbb**: Finds the index of `'A'` in the direct string indexing approach.

**Benchmark Results**

The latest benchmark results show that Chrome 53 running on a Mac OS X 10.10.5 device outperforms itself (i.e., the same test case runs faster with the same configuration) by a small margin, with `bbb` executing approximately 250 milliseconds fewer than `aaa`.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36

Browser/OS: Chrome 53 on Mac OS X 10.10.5

View result in a separate tab

Test name	Executions per second
aaa	7507096.5 Ops/sec
bbb	7562957.0 Ops/sec

Related benchmarks:

index of (version: 0)

Comparing performance of: aaa vs bbb

Created: 8 years ago by: Guest

Jump to the latest result

aaa

bbb

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):