Benchmark: Capitalize - MeasureThat.net

Tests:

1
function capitalizeFirstLetter(string) { return string.charAt(0).toUpperCase() + string.slice(1); } capitalizeFirstLetter('string');
2
function capitalizeFirstLetter(string) { return string.replace(/^./, string[0].toUpperCase()); } capitalizeFirstLetter('string');
3
function capitalizeFirstLetter(string) { return string[0].toUpperCase() + string.slice(1); } capitalizeFirstLetter('string');
4
String.prototype.capitalizeFirstLetter = function() { return this.charAt(0).toUpperCase() + this.slice(1); } 'string'.capitalizeFirstLetter();
5
String.prototype.capitalizeFirstLetter = function() { return this[0].toUpperCase() + this.slice(1); } 'string'.capitalizeFirstLetter();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
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Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll do my best to break down the provided benchmark and its test cases.

**Benchmark Overview**

The benchmark, named "Capitalize", measures the performance of different approaches to capitalize the first letter of a string in JavaScript. There are five test cases:

1. A standalone function `capitalizeFirstLetter` that takes a string as input.
2. A modified version of the same function with an additional regular expression-based approach.
3. Another version of the function, identical to the first one.
4. A method on the `String.prototype` object that capitalizes the first letter of a string.
5. Another version of the method on `String.prototype`, slightly different from the previous one.

**Options Compared**

The benchmark compares two approaches:

1. **Standalone Function**: The first test case uses a standalone function, where the implementation is self-contained and not dependent on any external object or prototype methods.
2. **Prototype Method**: The last three test cases use a method on the `String.prototype` object, which allows for more concise code but may incur overhead due to prototype pollution concerns.

**Pros and Cons**

1. **Standalone Function**
	* Pros:
		+ Easier to understand and maintain, as it's self-contained.
		+ Less likely to pollute the global scope or affect other parts of the codebase.
	* Cons:
		+ May have additional overhead due to function creation and invocation.
2. **Prototype Method**
	* Pros:
		+ More concise and expressive code, which can be beneficial for readability.
	* Cons:
		+ May pollute the global scope or affect other parts of the codebase if not used carefully.

**Library and Special JS Features**

None of the test cases use any external libraries or special JavaScript features beyond what is built into the language. The only notable aspect is the use of `String.prototype`, which allows for a more functional programming style but requires careful consideration to avoid polluting the prototype chain.

**Alternative Approaches**

Other possible approaches to capitalizing the first letter of a string in JavaScript could include:

1. Using `Array.prototype.map()` and `String.prototype.charAt()`.
2. Employing a custom `toUpperCase()` function for strings.
3. Utilizing a library or framework that provides such a method, if not already included.

These alternatives are not tested by the provided benchmark, but they demonstrate other ways to approach this common string manipulation task in JavaScript.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0

Browser/OS: Firefox 54 on Ubuntu

View result in a separate tab

Test name	Executions per second
1	10535549.0 Ops/sec
2	1349160.4 Ops/sec
3	10536575.0 Ops/sec
4	329572.3 Ops/sec
5	178426.4 Ops/sec

Related benchmarks:

Capitalize (version: 0)

Comparing performance of: 1 vs 2 vs 3 vs 4 vs 5

Created: 7 years ago by: Guest

Jump to the latest result

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5

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):