Benchmark: IndexOf vs substring 2

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')
Includes
const pattern = 'tempor'; let i = 0; while (i < rawText.length) { let currentChar = rawText[i]; if (rawText.substr(i, pattern.length) === pattern) { break; } i++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Includes

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 and explain what is tested, compared, and other considerations.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches: `indexOf` and a custom loop-based approach to find a substring in a given string (`rawText`). The test is designed to identify which approach is faster on modern JavaScript engines.

**Options Compared**

Two options are compared:

1. **`rawText.indexOf('tempor')`**: This is the built-in `indexOf` method, which searches for the specified value (in this case, `'tempor'`) in the string.
2. **Custom loop-based approach**: A custom loop uses a while loop to iterate through the characters of the string and checks if the current character matches the first character of the pattern (`pattern`). If a match is found, the loop breaks and returns.

**Pros and Cons**

**`indexOf` method:**

Pros:

* Faster and more efficient for most use cases
* Built-in function, so it's likely to be optimized by the JavaScript engine
* Easy to read and understand

Cons:

* May not work as expected if the string is null or undefined
* Limited control over the search process

**Custom loop-based approach:**

Pros:

* More control over the search process (e.g., allowing for custom pattern matching)
* Can be more efficient in certain cases, especially when searching for a specific pattern
* Works even when the input string is null or undefined

Cons:

* Slower and less efficient than the `indexOf` method for most use cases
* Requires manual loop management, which can lead to errors

**Library**

In this benchmark, no external libraries are used. However, if an external library were used, it would likely be a simple string manipulation library that provides optimized implementations of string searching algorithms.

**Special JS Features or Syntax**

There is one special feature in the custom loop-based approach: the use of `substr` to extract substrings from the original string. This feature is not specific to this benchmark but is a part of the JavaScript language.

**Alternative Approaches**

Other alternatives for finding a substring in a string could include:

* Using regular expressions (regex) with the `RegExp.test()` method
* Utilizing a library like Lodash or Ramda, which provide optimized string searching functions
* Implementing a more complex algorithm using techniques like Boyer-Moore or Knuth-Morris-Pratt string searching

**Benchmark Preparation Code**

The provided script preparation code creates a sample string (`rawText`) with the text "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." This string is used as the input for both benchmark test cases.

In summary, this benchmark compares two approaches to finding a substring in a given string: the built-in `indexOf` method and a custom loop-based approach. The results show that the `indexOf` method is significantly faster than the custom loop-based approach, but the latter provides more control over the search process.

Related benchmarks:

IndexOf vs substring 2 (version: 0)

Banana

Comparing performance of: IndexOf vs Includes

Created: 2 years ago by: Guest

Jump to the latest result

IndexOf

Includes

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):