Benchmark: slice vs substring (removing rightmost char)

Script Preparation code:

var example = 'there is no spoon'

Tests:

slice
var result = example.slice(0,example.length-1)
substring
var result = example.substring(0,example.length-1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
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 break down the provided JSON benchmark and explain what's being tested.

**Benchmark Definition**

The provided JSON defines a benchmark named "slice vs substring (removing rightmost char)" that compares two JavaScript methods: `slice()` and `substring()`. The purpose of this benchmark is to measure which method performs better when removing the last character from a string.

**Options Compared**

Two options are being compared:

1. `slice()`: This method returns a new string by extracting a section of a given string.
2. `substring()`: This method also extracts a section of a given string, but it requires specifying both start and end indices.

**Pros and Cons of Each Approach**

* **`slice()`**:
	+ Pros: More flexible, as you can extract any part of the string by providing two indices (start and end).
	+ Cons: Can be slower than `substring()` for removing a single character, since it involves creating a new string object.
* **`substring()```**:
	+ Pros: Faster for removing a single character, since it only needs to specify the start index and can use a technique called "optimal substring first" to avoid creating a new string object.
	+ Cons: Less flexible than `slice()`, as you need to specify both start and end indices.

**Other Considerations**

Both methods have performance implications due to how they handle string creation. When using `slice()`, the resulting string is created from scratch, which can be slower. In contrast, `substring()` may use a technique called "substring caching" (not explicitly shown in this benchmark), where it precomputes some information about the original string to quickly determine the substring length.

**Library and Its Purpose**

There is no library mentioned in the provided JSON. However, both `slice()` and `substring()` are built-in JavaScript methods that don't rely on external libraries.

**Special JS Features or Syntax**

None of the features or syntax used in this benchmark require special knowledge or extensions beyond standard JavaScript.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
slice	7659330.5 Ops/sec
substring	7694697.5 Ops/sec

Related benchmarks:

slice vs substring (removing rightmost char) (version: 0)

Compares slice and substring to each other when removing the rightmost character

Comparing performance of: slice vs substring

Created: one year ago by: Guest

Jump to the latest result

slice

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):