Benchmark: Remove First and Last Characters in String

Tests:

Via Array methods
var str = '//.*//' str = [...str] str.shift() str.pop() str.join('')
String.replace()
var str = '//.*//' str = str.replace(/^.|.$/g,'')
String.slice()
var str = '//.*//' str = str.slice(1,-1)
String.substring()
var str = '//.*//' str = str.substring(1,str.length-1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Via Array methods
String.replace()
String.slice()
String.substring()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.15

Browser/OS: Safari 26 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Via Array methods	7613029.0 Ops/sec
String.replace()	308000480.0 Ops/sec
String.slice()	329138656.0 Ops/sec
String.substring()	312920704.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to measure the performance of removing the first and last characters from a string in JavaScript. The test cases compare four different approaches:

1. Using Array methods (`shift()` and `pop()`)
2. Using the `replace()` method with a regular expression
3. Using the `slice()` method
4. Using the `substring()` method

**Test Cases**

Each test case is defined by a JSON object that contains the benchmark definition, test name, and no preparation code.

1. **Via Array methods**
	* Benchmark definition: `var str = '//.*//'\r\nstr = [...str]\r\nstr.shift()\r\nstr.pop()\r\nstr.join('')`
	* This approach uses array methods to remove the first and last characters from the string.
2. **String.replace()**
	* Benchmark definition: `var str = '//.*//'\r\nstr = str.replace(/^.|.$/g,'')`
	* This approach uses the `replace()` method with a regular expression to remove the first and last characters from the string.
3. **String.slice()**
	* Benchmark definition: `var str = '//.*//'\r\nstr = str.slice(1,-1)`
	* This approach uses the `slice()` method to remove the first and last characters from the string.
4. **String.substring()**
	* Benchmark definition: `var str = '//.*//'\r\nstr = str.substring(1,str.length-1)`
	* This approach uses the `substring()` method to remove the first and last characters from the string.

**Library Usage**

None of the test cases use a library, but they do rely on built-in JavaScript methods for string manipulation.

**Special JS Features/Syntax**

None of the test cases employ any special JavaScript features or syntax beyond what's standard in modern JavaScript (ECMAScript 2022).

**Other Alternatives**

Some alternative approaches to remove the first and last characters from a string could include:

* Using `str = str.slice(1, -1)` with no array methods
* Using a regex like `/^|.$/g` with `replace()`
* Using `str = str.split('')` followed by indexing
* Using a library like Lodash's `remove()` function

Keep in mind that the performance of these alternatives may vary depending on the specific use case and requirements.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **Via Array methods**
	* Pros: Simple, easy to implement
	* Cons: May incur additional overhead due to array manipulation
2. **String.replace()**
	* Pros: Fast, efficient regular expressions can be powerful tools
	* Cons: Regular expressions may add complexity and overhead
3. **String.slice()**
	* Pros: Lightweight, direct method call
	* Cons: Requires careful parameter handling (start, end indices)
4. **String.substring()**
	* Pros: Straightforward, easy to understand
	* Cons: May be slower than other methods due to string concatenation

Ultimately, the choice of approach depends on the specific requirements and constraints of your use case.

Related benchmarks:

Remove First and Last Characters in String (version: 0)

Comparing performance of: Via Array methods vs String.replace() vs String.slice() vs String.substring()

Created: 6 years ago by: Guest

Jump to the latest result

Via Array methods

String.replace()

String.slice()

String.substring()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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