Benchmark: Remove first symbol from string

Script Preparation code:

var str = "Hello World!";

Tests:

substring
let newStr = str.substring(1);
slice
let newStr = str.slice(1);
substr
let newStr = str.substr(1, str.length - 1);
replace
let newStr = str.replace(/^./, "");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
slice
substr
replace

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

The benchmark tests four different methods to remove the first character from a string: `substring`, `slice`, `substr`, and `replace`. The benchmark is designed to compare the performance of these methods on various browsers and devices.

**Method Comparison**

1. **`substring`**: This method returns a new string that starts at the specified index (in this case, 1) to the end of the original string.
	* Pros: Can be used with any string type, including non-ASCII characters.
	* Cons: May not be as efficient as other methods for large strings, and may involve more memory allocation.
2. **`slice`**: This method returns a new string that starts at the specified start index (in this case, 1) to the end of the original string.
	* Pros: Similar to `substring`, but with a slight performance advantage due to its use of a single operation instead of creating a new string.
	* Cons: May not be as efficient for very large strings or non-ASCII characters.
3. **`substr`**: This method returns a substring starting at the specified start index (in this case, 1) with the specified length (in this case, `str.length - 1`).
	* Pros: Can be used to extract substrings from larger strings efficiently.
	* Cons: May not be as flexible as other methods, and can lead to errors if the length is incorrect.
4. **`replace`**: This method replaces the first character of the string with an empty string.
	* Pros: Can be used for more complex string operations, including searching for specific patterns.
	* Cons: May have performance implications due to its use of a regular expression engine.

**Library and Special Features**

The benchmark uses no external libraries. However, it does utilize special features in JavaScript:

* The `substring`, `slice`, and `substr` methods are part of the built-in string prototype.
* The `replace` method is also part of the built-in string prototype, but it relies on a regular expression engine.

**Considerations**

When choosing between these methods, consider the following factors:

* Performance: For small to medium-sized strings, all four methods may have similar performance. However, for very large strings, `substring` or `slice` might be more efficient due to their use of a single operation.
* Flexibility: If you need to extract substrings from larger strings efficiently, `substr` is a good choice. For more complex string operations, such as searching for specific patterns, `replace` might be a better option.
* Memory allocation: Be aware that creating new strings using methods like `substring` or `slice` may lead to memory allocation issues for very large strings.

**Alternatives**

If you need to benchmark other methods or compare performance with different string manipulation techniques, consider the following alternatives:

* Use other built-in JavaScript methods, such as `concat`, `indexOf`, or `match`.
* Utilize external libraries like Lodash or Ramda for more complex string operations.
* Test different string encoding schemes, such as UTF-8 or Unicode normalization.
* Experiment with other programming languages, such as Python or Java, to see how they compare in terms of performance and efficiency.

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
substring	11731929.0 Ops/sec
slice	12647228.0 Ops/sec
substr	6508730.0 Ops/sec
replace	4630104.5 Ops/sec

Related benchmarks:

Remove first symbol from string (version: 0)

Comparing performance of: substring vs slice vs substr vs replace

Created: one year ago by: Registered User

Jump to the latest result

substring

slice

substr

replace

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):