Benchmark: Capitalize - MeasureThat.net

Tests:

1
function capitalizeFirstLetter(string) { return string[0].toUpperCase() + string.slice(1); } capitalizeFirstLetter('string');
2
function capitalizeFirstLetter(s) { return s[0].toUpperCase() + s.substr(1); } capitalizeFirstLetter('string');
3
function capitalizeFirstLetter(s) { s.replace(s[0], s[0].toUpperCase()); } capitalizeFirstLetter('string');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2
3

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarking on MeasureThat.net.

**Benchmark Definition JSON**

The provided Benchmark Definition JSON represents a simple JavaScript function that capitalizes the first letter of a given string. The definition includes three different implementations:

1. `capitalizeFirstLetter(string) { return string[0].toUpperCase() + string.slice(1); }`
2. `capitalizeFirstLetter(s) { return s[0].toUpperCase() + s.substr(1); }`
3. `capitalizeFirstLetter(s) { s.replace(s[0], s[0].toUpperCase()); }`

These implementations differ in their approach to capitalizing the first letter of the input string.

**Options Comparison**

The three implementations compared are:

1. **String slicing**: The first implementation uses `string.slice(1)` to extract the substring starting from the second character, and then concatenates it with the uppercase first character using `toUpperCase()`.
2. **String substr**: The second implementation uses `s.substr(1)` to achieve the same result as string slicing.
3. **String replacement**: The third implementation uses the `replace()` method to replace the first character of the input string with its uppercase equivalent.

**Pros and Cons**

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

* **String Slicing (1)**:
	+ Pros: Simple, efficient, and concise.
	+ Cons: May not work as expected for non-ASCII characters or strings containing newline characters.
* **String Substr (2)**:
	+ Pros: Similar to string slicing, but with a slightly different syntax.
	+ Cons: May not be as efficient due to the use of `substr()` method, which can lead to slower execution times.
* **String Replacement (3)**:
	+ Pros: Works well for all types of strings, including non-ASCII characters and newline characters.
	+ Cons: Can be less efficient than string slicing or substr due to the overhead of the `replace()` method.

**Library Usage**

None of the implementations use any external libraries. However, it's worth noting that some JavaScript engines may provide additional optimizations or features for certain strings, such as Unicode support.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in these examples. The focus is on simple string manipulation and optimization techniques.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

* **Regex**: You could use regular expressions to capitalize the first letter of the input string.
* **String method**: Some JavaScript engines provide additional string methods that can be used for this purpose, such as `toUpperCase()` and `slice()`.
* **Built-in functions**: Modern JavaScript provides built-in functions like `String.prototype.charAt()` and `String.prototype.toUpperCase()` that can be used to achieve similar results.

Keep in mind that the choice of approach ultimately depends on your specific use case, performance requirements, and personal preference.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Browser/OS: Chrome 59 on Windows

View result in a separate tab

Test name	Executions per second
1	6961900.5 Ops/sec
2	7711554.0 Ops/sec
3	3616321.0 Ops/sec

Related benchmarks:

Capitalize (version: 0)

Comparing performance of: 1 vs 2 vs 3

Created: 7 years ago by: Guest

Jump to the latest result

1

2

3

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):