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: 7 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

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String.slice()

329.1M/s

String.substring()

312.9M/s

String.replace()

308.0M/s

Via Array methods

7.6M/s

View exact numbers

Test name	Executions per second
✓ String.slice()	329,138,656 Ops/sec
String.substring()	312,920,704 Ops/sec
String.replace()	308,000,480 Ops/sec
Via Array methods	7,613,029 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.

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

Go 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):

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

Go 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):

Related benchmarks

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