Benchmark: IndexOf vs Includes str

Script Preparation code:

var str = 'banana sausage mufasa';

Tests:

IndexOf
str.indexOf('sausage') !== 1
Includes
str.includes('sausage')

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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I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark compares two methods for searching a string: `indexOf` and `includes`. The test case uses a predefined string "banana sausage mufasa" and checks if either method returns the expected result. The benchmark is designed to measure the performance of these two methods on different browsers and devices.

**Script Preparation Code**

The script preparation code sets up a variable `str` with a predefined string value: `"banana sausage mufasa"`. This code is executed before running each test case.

**Html Preparation Code**

There is no HTML preparation code, which means that the benchmark is focused solely on JavaScript performance and does not consider rendering or layout aspects of web pages.

**Test Cases**

The benchmark consists of two individual test cases:

1. `IndexOf`: The first test case measures the time it takes for Chrome 90 to execute the expression `str.indexOf('sausage') !== 1`. If the result is 1, the expression will return false; otherwise, it will return true.
2. `Includes`: The second test case measures the time it takes for Chrome 90 to execute the expression `str.includes('sausage')`.

**Comparison of Methods**

Both methods are compared, and their performance is measured:

* `indexOf` is a method that searches for the first occurrence of a substring within a string.
* `includes` is a method that checks if a string includes another string.

**Pros and Cons of Each Approach:**

1. `IndexOf`:
	* Pros:
		+ Typically faster than `includes` because it stops searching as soon as it finds a match.
		+ More straightforward to implement and understand.
	* Cons:
		+ May not work correctly if the search string is null or undefined.
		+ Returns only the index of the first occurrence, whereas `includes` returns a boolean value indicating presence or absence.
2. `Includes`:
	* Pros:
		+ More intuitive and easier to understand than `indexOf`.
		+ Works correctly even if the search string is null or undefined.
	* Cons:
		+ Typically slower than `indexOf` because it searches the entire string.

**Library Used:**

The benchmark does not explicitly mention any libraries used, but it assumes that the JavaScript engine supports these methods. If a library like Lodash were to be used, it might provide additional utility functions for working with strings.

**Special JS Feature/Syntax: None**

There is no special JavaScript feature or syntax being tested in this benchmark.

**Other Alternatives:**

If you want to create a similar benchmark for other string comparison methods, you could consider adding test cases for:

* `startsWith`
* `endsWith`
* `match` (using regular expressions)
* `replace`

Keep in mind that each method has its own strengths and weaknesses, and the choice of which one to use depends on your specific use case.

Related benchmarks:

IndexOf vs Includes str (version: 0)

Banana

Comparing performance of: IndexOf vs Includes

Created: 4 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):