Benchmark: indexOf vs split - test

Script Preparation code:

var test1 = 'test,tester,testing'
var test2 = 'test,tester'
var test3 = 'testa'

Tests:

indexOf
var result1 = (test1.indexOf('test') !== -1); var result2 = (test2.indexOf('tester') !== -1); var result3 = (test3.indexOf('test') !== -1);
split
var result1 = (test1.split(',').includes('test')); var result2 = (test2.split(',').includes('tester')); var result3 = (test3.split(',').includes('testa'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
split

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
indexOf	15569949.0 Ops/sec
split	8535877.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's tested on MeasureThat.net.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition, which includes the following information:

* `Name`: A unique name for the benchmark, in this case, "indexOf vs split - test".
* `Description`: A brief description of the benchmark, indicating that it tests speed.
* `Script Preparation Code` and `Html Preparation Code`: These sections contain JavaScript code that is executed before running the benchmark. In this case, they define two test strings: `test1`, `test2`, and `test3`. The purpose of these strings will become clear later.

**Individual Test Cases**

The benchmark definition includes two individual test cases:

* **indexOf**: This test case measures the performance of the `indexOf` method on an array or string.
	+ The `Benchmark Definition` code snippet demonstrates how to use `indexOf` on `test1`, `test2`, and `test3`. The expected result is a boolean value indicating whether the specified substring exists in the original string.
* **split**: This test case measures the performance of the `split()` method on an array or string.
	+ The `Benchmark Definition` code snippet demonstrates how to use `split()` with a comma-separated separator on `test1`, `test2`, and `test3`. The expected result is a boolean value indicating whether the specified substring exists in the resulting array.

**Pros, Cons, and Considerations**

The choice between using `indexOf` and `split()` depends on several factors:

* **Performance**: In general, `indexOf` is faster than `split()` because it only searches for an exact match, whereas `split()` creates a new array with substrings, which can be slower.
* **Readability**: `indexOf` is often considered more readable when searching for a specific substring within a string. However, `split()` can be useful when you need to extract substrings or split a string into an array of substrings.
* **Regular expressions**: If you need to search for patterns in strings, `indexOf` might not be the best choice, as it only searches for exact matches. In such cases, `split()` with regular expression support (e.g., using the `g` flag) or other libraries like RegEx might be more suitable.

**Library Usage**

The benchmark code uses a few built-in JavaScript functions:

* `indexOf()`: A built-in method for searching an index of the first occurrence of a substring within another string.
* `split()`: A built-in method for splitting a string into an array of substrings based on a specified separator.

No external libraries are required for this benchmark, as it only utilizes standard JavaScript functions.

**Special JS Features**

There is no special JavaScript feature or syntax mentioned in the provided code snippet. The focus is on comparing the performance of two fundamental string manipulation methods: `indexOf` and `split()`.

**Other Alternatives**

If you needed to test other string manipulation methods, here are some alternatives:

* **Substring replacement**: You could use `replace()` to find and replace substrings within a string.
* **Regular expressions**: As mentioned earlier, using RegEx with the `g` flag can provide more flexibility when searching for patterns in strings.
* **Array methods**: Other array methods like `includes()`, `findIndex()`, or `filter()` could be used to search for substrings within arrays.

Keep in mind that these alternatives would likely require different JavaScript code and might not directly compare to the performance of `indexOf` and `split()`.

Related benchmarks:

indexOf vs split - test (version: 0)

testing speed

Comparing performance of: indexOf vs split

Created: 5 years ago by: Guest

Jump to the latest result

indexOf

split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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