Benchmark: IndexOf vs substring 23

Script Preparation code:

var rawText = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.'

Tests:

IndexOf
rawText.indexOf('tempor')
While loop with substring
const find = () => { const pattern = 'tempor'; let i = 0; while (i < rawText.length) { let currentChar = rawText[i]; if (rawText.substr(i, pattern.length) === pattern) { return i; } i++; } } find();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
While loop with substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript benchmark on MeasureThat.net, which compares two approaches to find the index of a substring in a string: `indexOf` and a custom implementation using a while loop with `substring`.

**Benchmark Definition**

The benchmark definition includes:

* **Name**: "IndexOf vs substring 23"
* **Description**: "Banana" (this is likely just a placeholder text for demonstration purposes)
* **Script Preparation Code**: This code snippet initializes the `rawText` variable with a sample string.
* **Html Preparation Code**: None provided

**Test Cases**

There are two test cases:

1. **IndexOf**:
	* The benchmark definition uses the built-in `indexOf` method of the string, which is implemented by the browser's JavaScript engine.
2. **While loop with substring**:
	* This implementation manually searches for the substring using a while loop and the `substring` method.

**Options Compared**

The two approaches are compared:

1. **Built-in `indexOf` method**: The official method provided by the JavaScript standard library, which is typically implemented in a browser's engine.
2. **Custom implementation with while loop and `substring`**: A manually written function that uses a while loop to iterate over the string and checks if the substring matches.

**Pros and Cons**

* **Built-in `indexOf` method**:
	+ Pros: Typically faster, as it is implemented in the browser's engine and can take advantage of optimizations.
	+ Cons: May not be as flexible or customizable as a custom implementation.
* **Custom implementation with while loop and `substring`**:
	+ Pros: Can be more customizable, but may require more memory and processing power due to the manual iteration.
	+ Cons: Typically slower than the built-in method, as it requires explicit iteration.

**Library Used**

None is explicitly mentioned in the benchmark definition. However, both implementations use JavaScript's standard library methods (`indexOf` and `substring`).

**Special JS Features or Syntax**

The custom implementation uses a while loop with manual iteration, which is not typically used in everyday JavaScript development. This might be an attempt to demonstrate performance differences between different implementation approaches.

**Other Alternatives**

Other possible approaches could include:

1. **Regexp**: Using regular expressions can provide a more flexible way to search for substrings, but may come at the cost of additional overhead.
2. **String methods with callback functions**: Some JavaScript engines support using callback functions with string methods (e.g., `str.indexOf(callback)`). These approaches might be used in production code, but are not typically benchmarked.

Keep in mind that these alternatives would depend on specific requirements and performance characteristics of the application being built.

Related benchmarks:

IndexOf vs substring 23 (version: 0)

Banana

Comparing performance of: IndexOf vs While loop with substring

Created: 2 years ago by: Guest

Jump to the latest result

IndexOf

While loop with substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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