Benchmark: substring vs indexOf

Script Preparation code:

var example = 'there is no spoon'

Tests:

substring
var result = example.substring(10)
indexof
var result = example.indexOf("there")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
indexof

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0

Browser/OS: Firefox 133 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
substring	1365543552.0 Ops/sec
indexof	1362839040.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, compared, and their pros/cons.

**Benchmark Definition**

The benchmark is comparing two different approaches: `substring` and `indexOf`. Both methods are used to extract a subset of characters from a string. The goal is to determine which method is faster.

**Script Preparation Code**

The script preparation code is the same for both tests:
```javascript
var example = 'there is no spoon';
```
This creates a sample string that will be used for the benchmark.

**Html Preparation Code**

There is no HTML preparation code provided, which means this is a simple JavaScript-only benchmark.

**Individual Test Cases**

The two test cases are:

1. **substring**
```javascript
var result = example.substring(10);
```
This method extracts 9 characters starting from index 10 (not 11, since indexing starts at 0).

2. **indexOf**
```javascript
var result = example.indexOf("there");
```
This method searches for the substring "there" in the original string.

**Library Used**

Neither `substring` nor `indexOf` use any external libraries. They are built-in JavaScript methods.

**Special JS Feature/Syntax**

None of these methods require special JavaScript features or syntax beyond standard JavaScript syntax.

**Comparison**

The benchmark is comparing two approaches to extract a subset of characters from a string:

1. **Substring**: This method directly extracts a range of characters from the original string.
2. **IndexOf**: This method searches for a substring within the original string and returns its index (or -1 if not found).

Pros and Cons:

* **Substring**:
	+ Pros: More straightforward, easier to implement, and potentially faster since it's a direct operation on the string data.
	+ Cons: May be slower if the resulting slice is large or if the original string is very long.
* **IndexOf**:
	+ Pros: Can be faster for small substrings, as it only searches once.
	+ Cons: May be slower overall due to the search operation.

**Other Alternatives**

If you wanted to compare these methods with alternative approaches:

1. Using `slice()` instead of `substring`: This would have similar performance characteristics to `substring`, but uses a different method to extract the slice.
2. Using regular expressions: This would be slower than both `substring` and `indexOf`, as it involves additional overhead for pattern matching.

Keep in mind that this benchmark is focused on comparing two specific methods, rather than exploring other alternatives.

Related benchmarks:

substring vs indexOf (version: 0)

Comparing performance of: substring vs indexof

Created: 2 years ago by: Guest

Jump to the latest result

substring

indexof

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):