Benchmark: indexOf vs substring

Script Preparation code:

url = "http://someuri.com";

Tests:

indexOf
url.indexOf("http") === 0;
substring
url.substring(0, 4) === "http";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
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):

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Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that contains two main pieces of information:

1. **Script Preparation Code**: This section specifies a JavaScript code snippet that is executed before running each benchmark. In this case, it sets a variable `url` to a specific URI.
2. **Html Preparation Code**: This section is empty, indicating that no additional HTML setup is required for the benchmarks.

**Individual Test Cases**

There are two test cases:

1. **indexOf**: The benchmark definition is `url.indexOf("http") === 0`.
	* Purpose: This test case measures the execution time of the `indexOf` method on the `url` string.
2. **substring**: The benchmark definition is `url.substring(0, 4) === "http"`.
	* Purpose: This test case measures the execution time of the `substring` method on the `url` string.

**Options Compared**

The two options being compared are:

1. Using `indexOf`
2. Using `substring`

**Pros and Cons of Each Approach**

1. **IndexOf**
	* Pros:
		+ Faster lookup times since it uses a binary search algorithm.
		+ More suitable for large strings or datasets where fast lookup is crucial.
	* Cons:
		+ May be slower than `substring` for small strings due to the overhead of the binary search algorithm.
2. **Substring**
	* Pros:
		+ Often faster than `indexOf` for small strings since it doesn't require a binary search.
		+ More suitable for cases where you need to extract a substring from a larger string.
	* Cons:
		+ May be slower than `indexOf` for large strings due to the overhead of creating and manipulating substrings.

**Library Usage**

There is no explicit library usage in these benchmark definitions. However, it's worth noting that both `indexOf` and `substring` are built-in JavaScript methods that operate on strings.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in these benchmark definitions. The code snippets are straightforward and don't utilize any advanced JavaScript concepts like async/await, promises, or closures.

**Other Alternatives**

If you wanted to compare other string comparison methods, you could consider adding more test cases for:

* `startsWith()`
* `endsWith()`
* Regular expression matching (`RegExp.test()` or `String.prototype.match()`)
* Other library-based solutions, such as using a dedicated library like `lodash` or `underscore`

Keep in mind that these alternatives may have different performance characteristics and might be more suitable depending on your specific use case.

Related benchmarks:

indexOf vs substring (version: 0)

Comparing performance of: indexOf vs substring

Created: 5 years ago by: Registered User

Jump to the latest result

indexOf

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):