Benchmark: Classes vs Prototype vs ES classes

Tests:

Classes
"use strict"; function _instanceof(left, right) { if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) { return right[Symbol.hasInstance](left); } else { return left instanceof right; } } function _classCallCheck(instance, Constructor) { if (!_instanceof(instance, Constructor)) { throw new TypeError("Cannot call a class as a function"); } } function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; } var Person = /*#__PURE__*/ function () { function Person() { _classCallCheck(this, Person); this.spoken = ''; } _createClass(Person, [{ key: "speak", value: function speak(frase) { this.spoken += "".concat(frase, ". "); } }]); return Person; }(); var person = new Person(); person.speak('Hello world'); person.speak('Anybody out there?'); person.speak('Ok Im out!');
Prototype
function Person () { this.spoken = '' } Person.prototype.speak = function (frase) { this.spoken += frase + '. ' } var person = new Person() person.speak('Hello world'); person.speak('Anybody out there?'); person.speak('Ok Im out!');
ES classes
class Person { constructor() { this.spoken = ''; } speak(frase) { this.spoken += frase + '. ' } } var person = new Person() person.speak('Hello world'); person.speak('Anybody out there?'); person.speak('Ok Im out!');
ES classes with var
var Person = class { constructor() { this.spoken = ''; } speak(frase) { this.spoken += frase + '. ' } }; var person = new Person() person.speak('Hello world'); person.speak('Anybody out there?'); person.speak('Ok Im out!');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Classes
Prototype
ES classes
ES classes with var

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

The provided JSON represents a JavaScript benchmark test that compares the performance of three different approaches to define classes in JavaScript:

1. **Prototypal inheritance** (Prototype):
In this approach, classes are defined using the `function` keyword followed by parentheses containing the class name. The constructor function is used to initialize the instance variables. This approach uses the prototype chain to inherit properties and methods.

Example:
```javascript
function Person() {
  this.spoken = '';
}
Person.prototype.speak = function(frase) {
  this.spoken += frase + '. ';
}
var person = new Person();
person.speak('Hello world');
```

2. **ES classes** (ES classes):
In this approach, classes are defined using the `class` keyword followed by a class name. The class body contains the properties and methods of the class. This approach uses a new syntax introduced in ECMAScript 2015.

Example:
```javascript
class Person {
  constructor() {
    this.spoken = '';
  }
  speak(frase) {
    this.spoken += frase + '. ';
  }
}
var person = new Person();
person.speak('Hello world');
```

3. **ES classes with var** (ES classes with var):
This approach is similar to the previous one, but it uses the `var` keyword to declare the class.

Example:
```javascript
var Person = class {
  constructor() {
    this.spoken = '';
  }
  speak(frase) {
    this.spoken += frase + '. ';
  }
};
var person = new Person();
person.speak('Hello world');
```

**Options compared:**

* Prototypal inheritance (Prototype)
* ES classes
* ES classes with var

**Pros and Cons of each approach:**

1. **Prototypal inheritance (Prototype)**
	* Pros:
		+ Wide support across browsers and JavaScript engines.
		+ Easy to implement and understand.
	* Cons:
		+ Less intuitive than modern class syntax.
2. **ES classes**
	* Pros:
		+ Modern, concise syntax.
		+ Easier to read and maintain code.
	* Cons:
		+ Requires support for ECMAScript 2015 or later.
3. **ES classes with var**
	* Pros: Similar to ES classes, but using `var` keyword.
	* Cons: Same as ES classes.

**Other considerations:**

* The benchmark test measures the performance of these three approaches in a specific scenario, highlighting any potential differences in execution speed.
* The results show that Firefox 96 performs best with Prototype (ES5) and ES classes, while ES classes with var is slower.

**Alternatives:**

* **Class expressions:** Instead of using `class` or `function`, you can define classes using function expressions. For example:
```javascript
var Person = function() {
  this.spoken = '';
};
Person.prototype.speak = function(frase) {
  this.spoken += frase + '. ';
};
var person = new Person();
person.speak('Hello world');
```
This approach is similar to prototypal inheritance but uses a function expression instead of the `class` keyword.

Overall, the benchmark test highlights the performance differences between these three approaches and provides insight into the trade-offs involved in choosing one over the others.

Related benchmarks:

Classes vs Prototype vs ES classes (version: 0)

Comparing performance of: Classes vs Prototype vs ES classes vs ES classes with var

Created: 5 years ago by: Registered User

Jump to the latest result

Classes

Prototype

ES classes

ES classes with var

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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