Benchmark: indexOf v Split - MeasureThat.net

Script Preparation code:

var test1 = '123-4567'
var test2 = 'testing12345-testing6789'

Tests:

IndexOf
var prfx1 = test1.substr(0, test1.indexOf('-')); var sfx1 = test1.substr(test1.indexOf('-') + 1); var prfx1 = test2.substr(0, test2.indexOf('-')); var sfx1 = test2.substr(test2.indexOf('-') + 1);
Split
const testArr1 = test1.split('-') const testArr2 = test2.split('-') var prfx1 = testArr1[0]; var sfx1 = testArr1[1]; var prfx1 = testArr2[0]; var sfx1 = testArr2[0]

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: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser/OS: Chrome 91 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
IndexOf	1992411.1 Ops/sec
Split	3245409.8 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and its components.

**Benchmark Overview**

The test is designed to compare two approaches for extracting prefixes and suffixes from strings in JavaScript: using the `indexOf()` method or splitting the string into substrings using the `-` character as a delimiter. The goal is to determine which approach is faster.

**Options Compared**

Two options are compared:

1. **IndexOf**: Uses the `indexOf()` method to find the index of the `-` character and then extracts the prefix and suffix using substring manipulation.
2. **Split**: Splits the string into substrings using the `-` character as a delimiter and directly accesses the first two elements of the resulting array to extract the prefix and suffix.

**Pros and Cons**

1. **IndexOf**:
	* Pros: May be more intuitive for developers familiar with string manipulation in JavaScript.
	* Cons: Can be slower due to the overhead of calling `indexOf()`, which may involve a search algorithm that's not optimized for this specific use case.
2. **Split**:
	* Pros: Generally faster, as it avoids the overhead of `indexOf()` and leverages the optimized string splitting mechanism in JavaScript engines.
	* Cons: May be less intuitive for developers without experience with array manipulation or regular expressions.

**Library/Functionality Used**

None explicitly mentioned in the provided benchmark. However, the `substr` method is used, which is a built-in JavaScript function that extracts a subset of characters from a string. This is part of the ECMAScript standard and should be supported by most modern browsers and environments.

**Special JS Feature/Syntax**

No special features or syntax are explicitly mentioned in the provided benchmark. However, the use of template literals (`\r\n`) and concatenation (`+`) may indicate that this benchmark targets older JavaScript versions (e.g., before ECMAScript 2015).

**Other Alternatives**

Some alternative approaches to compare with `IndexOf` and `Split` could be:

1. Using regular expressions (`RegExp`) to extract the prefix and suffix.
2. Utilizing a custom implementation using a simple loop or recursion.

However, without additional context or modifications to the benchmark, it's difficult to accurately assess the performance of these alternative approaches.

For more accurate comparisons, consider adding test cases that use different libraries, functions, or syntax features.

Related benchmarks:

indexOf v Split (version: 0)

Comparing performance of: IndexOf vs Split

Created: 3 years ago by: Guest

Jump to the latest result

IndexOf

Split

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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