Benchmark: String.indexOf vs String.indexOf with the second parameter

Script Preparation code:

const str = 'a(sss)'

Tests:

no `position` param
'a(sss)'.indexOf(')')
with `position` param
'a(sss)'.indexOf(')', 2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
no `position` param
with `position` param

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
no `position` param	2011814016.0 Ops/sec
with `position` param	99338264.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON and explain what's being tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark is designed to compare two approaches for finding the index of a substring in a string:

1. `String.indexOf()` with no position parameter (`"no `position` param"` test case)
2. `String.indexOf()` with the second parameter specifying the position from which to start searching (`"with `position` param"` test case)

**Script Preparation Code**

The script preparation code is:
```javascript
const str = 'a(sss)';
```
This sets a variable `str` containing the string "a(sss)".

**Html Preparation Code**

There is no HTML preparation code provided, which means that this benchmark only tests JavaScript performance and does not involve any rendering or layout considerations.

**Individual Test Cases**

The two test cases are:

1. `"no `position` param"`:
This test case uses the default behavior of `String.indexOf()`, where it starts searching from the beginning of the string.
2. `"with `position` param"`:
This test case uses the second parameter to specify a starting position for the search.

**Pros and Cons**

Here's a brief summary:

* **No Position Parameter (`"no `position` param"`)**:
	+ Pros: Simple, straightforward approach that can be faster if the string is shorter.
	+ Cons: May perform slower on longer strings since it has to search from the beginning.
* **With Position Parameter (`"with `position` param"`)**:
	+ Pros: Can be faster for longer strings or when searching from a specific position.
	+ Cons: Requires an additional parameter, which can add complexity and may have a slight overhead.

**Other Considerations**

* The use of the second parameter to specify the position is not unique to JavaScript and is commonly used in many programming languages.
* The `String.indexOf()` method is generally optimized for performance, but its behavior can vary depending on the browser and engine being used.

**Library and Its Purpose**

There are no libraries mentioned in the provided benchmark definition. However, it's worth noting that some JavaScript engines may use internal optimizations or caching mechanisms that could affect the performance of `String.indexOf()`. For example, SpiderMonkey (used by Firefox) has a cache for string indexing operations.

If you're interested in exploring alternative approaches or modifications to this benchmark, here are some options:

1. **Use a different string length**: You can increase the length of the `str` variable to test how the two approaches scale.
2. **Use a different substring**: Replace the `")"` character with another substring (e.g., `"abc"`) to test how the indexing method performs on more complex searches.
3. **Modify the search position**: Change the starting position parameter in one of the test cases to see how it affects performance.
4. **Compare with other indexing methods**: You could explore alternative string indexing methods, such as `String.prototype.indexOf()` or using a custom implementation like a Boyer-Moore algorithm.

Keep in mind that these modifications will require adjusting the benchmark definition and test data accordingly.

Related benchmarks:

String.indexOf vs String.indexOf with the second parameter (version: 0)

Find the index of ")"

Comparing performance of: no `position` param vs with `position` param

Created: 2 years ago by: Guest

Jump to the latest result

no `position` param

with `position` param

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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