Benchmark: camelize - MeasureThat.net

Script Preparation code:

function camelize(str, $ucfirst) {
    if ($ucfirst === void 0) { $ucfirst = false; }
    var $return = str.replace(/^([A-Z])|[\s-_]+(\w)/g, function (match, p1, p2) {
        return p2 ? p2.toUpperCase() : p1.toLowerCase();
    });
    return $ucfirst ? $return.charAt(0).toUpperCase() + $return.slice(1) : $return;
};

function toCamelCase(str) {
  let s =
    str &&
    str
      .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
      .map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())
      .join('');
  return s.slice(0, 1).toLowerCase() + s.slice(1);
};

Tests:

camelize
camelize('some_database_field_name'); camelize('Some label that needs to be camelized'); camelize('some-javascript-property'); camelize('some-mixed_string with spaces_underscores-and-hyphens');
toCamelCase
toCamelCase('some_database_field_name'); toCamelCase('Some label that needs to be camelized'); toCamelCase('some-javascript-property'); toCamelCase('some-mixed_string with spaces_underscores-and-hyphens');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
camelize
toCamelCase

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Android 13; Mobile; rv:129.0) Gecko/129.0 Firefox/129.0

Browser/OS: Firefox Mobile 129 on Android

View result in a separate tab

Test name	Executions per second
camelize	484403.2 Ops/sec
toCamelCase	338634.9 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 explain what's being tested.

**Benchmark Definition**

The provided JSON represents two JavaScript benchmarks: `camelize` and `toCamelCase`. Both benchmarks aim to measure the performance of string manipulation functions in JavaScript.

**What is tested?**

* The `camelize` function takes a string as input and converts it to camelCase (also known as PascalCase or Upper-CamelCase). The function checks if the `$ucfirst` parameter is provided; if not, it defaults to `false`, which means only lowercase letters will be converted to uppercase.
* The `toCamelCase` function takes a string as input and converts it to camelCase.

**Options compared**

The two benchmarks compare the performance of different approaches for string manipulation:

1. **String replacement with regular expressions**: Both functions use this approach, but they have some differences in implementation details.
2. **Using a library**: The `toCamelCase` function uses a library ( likely the same one used by the `camelize` function), which provides a pre-existing implementation of camelCase conversion.

**Pros and cons**

* Using string replacement with regular expressions has the advantage of being a built-in JavaScript feature, making it easier to maintain and understand. However, it might be slower than using a dedicated library.
* Using a library can provide faster execution times, as the library's implementation is optimized for performance. However, it requires additional dependencies and might have a steeper learning curve.

**Library**

The `toCamelCase` function uses the `camelcase` library, which provides a simple and efficient implementation of camelCase conversion.

**Special JS feature or syntax**

None mentioned in the provided code.

**Other considerations**

* **Optimization techniques**: The benchmarks might be optimized for specific use cases or hardware platforms. For example, some optimizations might be made for mobile devices or older browsers.
* **JavaScript engine differences**: The benchmarks may not account for differences between JavaScript engines (e.g., V8, SpiderMonkey) and their impact on performance.

**Alternative approaches**

Other alternatives for string manipulation in JavaScript include:

1. Using the `String.prototype.replace()` method with a custom regular expression.
2. Utilizing built-in JavaScript features like `toLowerCase()`, `toUpperCase()`, and `split()`.
3. Implementing a custom string manipulation function using loops and bitwise operations.

Keep in mind that each approach has its trade-offs, and the choice of implementation depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

camelize (version: 0)

Comparing performance of: camelize vs toCamelCase

Created: 7 years ago by: Guest

Jump to the latest result

camelize

toCamelCase

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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