Benchmark: split index 0 vs regex replace v2

Tests:

replace regex
'20240910T13:45:22.030Z'.replace(/T.*$/, '');
split index 0
'20240910T13:45:22.030Z'.split("T")[0];
slice
'20240910T13:45:22.030Z'.slice(0, 8);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
split index 0
slice

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
replace regex	18792946.0 Ops/sec
split index 0	29254788.0 Ops/sec
slice	162179136.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its various components.

**Benchmark Definition**

The benchmark definition is a JSON object that represents the test case to be executed. In this case, there are three test cases:

1. `split index 0`: This test case uses the `split()` method with an index of 0 to split a string.
2. `replace regex`: This test case uses the `replace()` method with a regular expression to replace a part of a string.
3. `slice`: This test case uses the `slice()` method to extract a subset of characters from a string.

**Options Compared**

The benchmark is comparing three different approaches:

1. **`split()`**: This method splits a string into an array of substrings using a specified separator. In this case, it's used with an index of 0.
2. **`replace()`**: This method replaces occurrences of a specified pattern in a string with another value.
3. **`slice()`**: This method extracts a subset of characters from a string.

**Pros and Cons**

Here are the pros and cons of each approach:

1. **`split()`**:
	* Pros: Fast, efficient, and easy to use.
	* Cons: Can be slow for large strings or complex separators.
2. **`replace()`**:
	* Pros: Can handle complex patterns and substitutions.
	* Cons: Can be slower than `split()` due to the overhead of regular expressions.
3. **`slice()`**:
	* Pros: Fast, efficient, and easy to use for substring extraction.
	* Cons: Limited to extracting substrings; can't perform complex string operations.

**Library and Purpose**

None of the test cases use a library explicitly. However, it's likely that the `split()` method is implementing some form of internal logic to handle splitting strings.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark. All three methods (`split()`, `replace()`, and `slice()`) are standard JavaScript methods.

**Other Alternatives**

If you need alternative methods for string manipulation, here are a few options:

1. **`substr()`**: Similar to `slice()`, but returns a substring starting from the beginning of the original string.
2. **`substring()`**: A variant of `slice()` that takes an offset and length as arguments.
3. **`indexOf()`** and ``lastIndexOf()`**: These methods search for the presence of a specified value in a string and return its index.

These alternatives may offer different trade-offs in terms of performance, ease of use, or feature set compared to the original three methods.

Related benchmarks:

split index 0 vs regex replace v2 (version: 0)

Comparing performance of: replace regex vs split index 0 vs slice

Created: 3 months ago by: Guest

Jump to the latest result

replace regex

split index 0

slice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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