Benchmark: create object with / without prototype

Script Preparation code:

function Foo(a, b, c) {

    this.a = a;
    this.b = b;
    this.c = c;

    this.sum = function() {

        return this.a + this.b + this.c;
    }
}

function Bar(a, b, c) {

    this.a = a;
    this.b = b;
    this.c = c;

}

Bar.prototype.sum = function() {

    return this.a + this.b + this.c;
}

Tests:

With prototype
const bar = new Bar (1, 2, 3); bar.sum ();
Without
const foo = new Foo (1, 2, 3); foo.sum ();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
With prototype
Without

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark is testing two approaches to create an object with a `sum` method. There are two scripts: `Foo` and `Bar`. Both scripts have a constructor that takes three arguments (`a`, `b`, and `c`) and assigns them to the object's properties (`this.a`, `this.b`, and `this.c`). However, the difference lies in how the `sum` method is defined.

**Option 1: Without Prototype (Foo)**

In this approach, the `sum` method is defined inside the constructor function itself. This means that every time a new object is created using the `Foo` constructor, it will have its own separate `sum` method that can be called independently.

Pros:

* Each instance has its own scope, which might be beneficial for performance-critical applications.
* The `sum` method can be overridden by subclassing `Foo`.

Cons:

* Every time a new object is created, the code inside the constructor function needs to be executed again, which can lead to slower startup times.
* If multiple instances need to access the same data or perform similar calculations, this approach might not be efficient.

**Option 2: With Prototype (Bar)**

In this approach, the `sum` method is defined as a prototype method on the `Bar` constructor. This means that every instance of `Bar` will share the same `sum` method, and any modifications to it will affect all instances.

Pros:

* Faster startup times since the code only needs to be executed once when creating the first instance.
* Easier maintenance and updates to the `sum` method since it's shared among all instances.

Cons:

* If multiple instances need to access different data or perform unique calculations, this approach might not be suitable.
* Any modifications to the `sum` method can break existing code that relies on its behavior.

**Library: Lodash**

The benchmark definition uses a fictional library called `Lodash`, which is likely used for various utility functions. In this case, it's possible that `Lodash` provides a function like `assign()` or `extend()` that helps create objects with certain properties. However, since no specific `Lodash` function is mentioned in the benchmark definition, we'll assume it's just a placeholder.

**Special JS feature: ES6 class syntax**

The benchmark definition uses the ES6 class syntax to define constructors (`Bar` and `Foo`). This means that the code is written in a modern JavaScript dialect, which can make it more readable and maintainable. However, this approach might not be compatible with older browsers or versions of JavaScript.

**Other alternatives**

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

1. **Using `Object.create()`**: Instead of using constructors like `Bar` and `Foo`, you could create objects by calling `Object.create()`. This approach would eliminate the need for constructors and prototypes.
2. **Using `Object.assign()`**: You could use `Object.assign()` to copy properties from an object into a new object. This approach would simplify object creation but might not be as efficient as constructors or prototype methods.
3. **Using a library like Backbone.js**: If you're building a complex application, consider using a framework like Backbone.js, which provides its own way of creating objects with methods and behaviors.

Keep in mind that these alternatives might have trade-offs in terms of performance, readability, or maintainability, depending on your specific use case.

Related benchmarks:

create object with / without prototype (version: 0)

Comparing performance of: With prototype vs Without

Created: 4 years ago by: Guest

Jump to the latest result

With prototype

Without

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):