Benchmark: slice vs substr vs substring (try with 100)

Script Preparation code:

var example = 'there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon there is no spoon'

Tests:

slice
var result = example.slice(100)
substr
var result = example.substr(100)
substring
var result = example.substring(100)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
substring

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Definition**

The benchmark is designed to compare the performance of three string slicing methods in JavaScript: `slice()`, `substr()`, and `substring()`. The test case uses a large string with 100 characters repeated multiple times.

**Options Compared**

The benchmark compares the execution speed of these three methods:

1. `slice()`: Returns a new string containing the specified number of characters.
2. `substr()`: Returns a new string containing the specified length of characters, starting at the specified index.
3. `substring()`: Returns a new string containing the specified number of characters, starting at the specified index.

**Pros and Cons**

Here are some pros and cons for each method:

1. `slice()`:
	* Pros: Can be faster than `substr()` or `substring()` because it doesn't require specifying the length.
	* Cons: May not be suitable when only a start index is provided, as you need to specify the length.
2. `substr()`: 
	* Pros: Can be used when only a start index is provided, but may be slower than `slice()` due to the overhead of specifying the length.
3. `substring()`: 
	* Pros: Suitable for when both a start and end index are provided, which can be faster than using `substr()`.
	* Cons: May not be suitable when only a start index is provided.

**Library**

There is no explicit library mentioned in the benchmark definition. However, it's likely that the JavaScript engine being tested (e.g., V8 in Node.js or SpiderMonkey in Firefox) uses some internal optimizations and implementation details to execute these methods.

**Special JS Feature/Syntax**

The benchmark doesn't explicitly use any special JavaScript features or syntax beyond the standard language specification. It does rely on the JavaScript engine's optimization capabilities, which might include things like:

* Inlining: The compiler might inline function calls for better performance.
* Register allocation: The engine might allocate registers to hold temporary values during execution.

**Alternatives**

Other alternatives that could be used to benchmark string slicing methods might include:

1. `indexOf()`: Instead of slicing, you could use the `indexOf()` method to find the index of a specific character or substring and then slice from there.
2. Regular expressions: You could use regular expressions to extract a substring from a larger string.
3. String manipulation functions: Some JavaScript engines provide optimized string manipulation functions like `strRepeat()` (Node.js) or `STRREP()` (SpiderMonkey).

Keep in mind that these alternatives might not be directly comparable to the original benchmark, as they may have different performance characteristics or requirements.

I hope this explanation helps! Let me know if you have any further questions.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0

Browser/OS: Firefox 99 on Linux

View result in a separate tab

Test name	Executions per second
slice	107298600.0 Ops/sec
substr	99509824.0 Ops/sec
substring	92254600.0 Ops/sec

Related benchmarks:

slice vs substr vs substring (try with 100) (version: 0)

Compares slice, substr and substring to each other when there is only a start index

Comparing performance of: slice vs substr vs substring

Created: 4 years ago by: Guest

Jump to the latest result

slice

substr

substring

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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