Benchmark: capitalize 2 versions

Tests:

slice concat
const string = 'aaaBBBCccc' const newString = string.charAt(0).toUpperCase() + string.slice(1);
replace
const string = 'aaaBBBCccc' const newString = string.replace(/^[a-z]/, s => s.toUpperCase())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice concat
replace

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Windows

View result in a separate tab

Test name	Executions per second
slice concat	647261184.0 Ops/sec
replace	2174800.8 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**What is tested?**

MeasureThat.net tests two different approaches to capitalizing a string in JavaScript:

1. Using `charAt(0).toUpperCase()` followed by `slice(1)`: This approach extracts the first character of the string, converts it to uppercase, and then concatenates the rest of the original string.
2. Using `replace(/^[a-z]/, s => s.toUpperCase())`: This approach uses a regular expression to match the first character that is lowercase (`^[a-z]`) and replaces it with its uppercase equivalent.

**Options compared**

The two approaches are being compared in terms of their performance. The benchmark aims to determine which method is faster, more efficient, or has better performance characteristics for capitalizing strings.

**Pros and Cons**

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

1. `charAt(0).toUpperCase() + string.slice(1)`:
	* Pros: Simple, straightforward, and easy to understand.
	* Cons: May involve extra overhead due to the `toUpperCase()` method call on a single character.
2. `replace(/^[a-z]/, s => s.toUpperCase())`:
	* Pros: More efficient for longer strings, as it only needs to process the first character.
	* Cons: Requires a regular expression engine, which can introduce additional overhead.

**Library usage**

In both test cases, no external libraries are used beyond JavaScript's built-in functions. However, if we consider popular string manipulation libraries like Lodash or String-pose, they might be used in real-world scenarios to achieve similar results.

**Special JS features or syntax**

There are no special JavaScript features or syntax explicitly mentioned in the benchmark definitions. However, it's worth noting that both approaches use standard JavaScript methods (`charAt()`, `slice()`, and `replace()`).

**Other alternatives**

Some alternative approaches for capitalizing strings might include:

* Using a more advanced regular expression approach with capturing groups.
* Implementing a custom string-capitalization function using bitwise operations or character properties (e.g., `charCodeAt()`).
* Utilizing a library like UnicodeNormalizer to handle Unicode characters.

Keep in mind that these alternatives may not be relevant to the specific benchmark being tested, which focuses on comparing two straightforward approaches.

Related benchmarks:

capitalize 2 versions (version: 0)

Comparing performance of: slice concat vs replace

Created: 2 years ago by: Guest

Jump to the latest result

slice concat

replace

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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