Benchmark: slice vs split vs substring (with start and end)

Script Preparation code:

var str = "https://line.me/R/app/234?argument=AAAAA160&liff_id=234&client_id=def&basic_id=uvw";

Tests:

slice
var result = str.slice(0, str.indexOf('?'));
split
var result = str.split('?')[0];
substring
var result = str.substring(0, str.indexOf('?'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
split
substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0

Browser/OS: Firefox 126 on Windows

View result in a separate tab

Test name	Executions per second
slice	943793152.0 Ops/sec
split	6387955.5 Ops/sec
substring	1070050368.0 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 its test cases to understand what is being tested.

**Benchmark Overview**

The benchmark compares the performance of three string manipulation methods: `slice()`, `split()` (without a specified separator), and `substring()` when only a start index is provided. The goal is to determine which method is the most efficient in this specific scenario.

**Options Compared**

* **slice()**: This method extracts a section of a string from a specified start index to the end of the string.
* **split() (without separator)**: Although not strictly equivalent, some browsers may optimize `split()` without a separator to only find the first occurrence of the start index. In this case, it's assumed to be treated as finding the first character at the specified index.
* **substring()**: This method extracts a section of a string from a specified start index to the end of the string.

**Pros and Cons of Each Approach**

1. **slice()**:
	* Pros: Generally efficient, as it only needs to calculate the length of the substring.
	* Cons: May be slower if the start index is near the end of the string, as it requires calculating the remaining characters in the string.
2. **split() (without separator)**:
	* Pros: Can be faster when the start index is near the beginning of the string, as it only needs to find the first occurrence of the character at that index.
	* Cons: May not be optimized correctly in all browsers or versions, and can lead to unexpected results if not used carefully.
3. **substring()**:
	* Pros: Typically efficient, as it only needs to calculate the length of the substring.
	* Cons: May be slower when the start index is near the end of the string, similar to `slice()`.

**Library Usage**

None of the test cases use any external libraries, making them self-contained and focused on the JavaScript built-in functions being compared.

**Special JS Feature/Syntax**

None of the provided code snippet uses any special JavaScript features or syntax that would affect the benchmark's outcome. The focus is solely on comparing the performance of these three string manipulation methods.

**Other Alternatives**

If you're interested in exploring alternative string manipulation methods, consider:

* **concat()**: Concatenating strings using `+` operator can be faster than the built-in functions for small substrings.
* **regular expressions (regex)**: Using regex to extract a substring from another string can be more efficient for specific use cases but may introduce additional overhead due to the complexity of regex syntax and processing.

In summary, this benchmark compares the performance of `slice()`, `split()` without a separator, and `substring()` when only a start index is provided. The results will help you understand which method is most efficient in this specific scenario, taking into account factors like browser version, device platform, and operating system.

Related benchmarks:

slice vs split vs substring (with start and end) (version: 0)

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

Comparing performance of: slice vs split vs substring

Created: one year ago by: Guest

Jump to the latest result

slice

split

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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