Benchmark: Object.assign vs prototype

Tests:

Extend prototype
String.prototype.toBinary = function () { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(2) + " "; } return output; } String.prototype.toHex = function () { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(8) + " "; } return output; } for (let i = 0; i < 1000; i++) { let t = new String("test"); console.log(t.toString(), t.toBinary(), t.toHex()); }
Object.assign
Object.assign(String, { toBinary() { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(2) + " "; } return output; }, toHex() { let output = ''; for (let i = 0; i < this.length; i++) { output += this[i].charCodeAt(0).toString(8) + " "; } return output; } }); for (let i = 0; i < 1000; i++) { let t = new String("test"); console.log(t.toString(), t.toBinary(), t.toHex()); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Extend prototype
Object.assign

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 benchmark and explain what's being tested, compared options, pros and cons, library usage, special JavaScript features or syntax, and alternatives.

**What's being tested:**
The benchmark measures the performance difference between two approaches to add methods to a string object using `Object.assign()`:

1. **Extend prototype**: Adding methods to the `String` prototype directly.
2. **Object.assign**: Using `Object.assign()` to extend a new object with properties and methods.

**Options compared:**

* Extend prototype: Adding methods to the `String` prototype, which is executed at startup, making it available to all instances of `String`.
* Object.assign: Creating a new object with the desired properties and methods, which requires a function call and can lead to slower performance due to the overhead of creating a new object.

**Pros and cons of each approach:**

* Extend prototype:
	+ Pros:
		- Faster execution, as the methods are already available on all `String` instances.
		- Less memory allocation, as no new objects are created.
	+ Cons:
		- More memory usage due to the addition of multiple properties (methods) on the global object.
		- Less flexibility, as changes made through `Object.assign()` may not be propagated to all instances.
* Object.assign:
	+ Pros:
		- More flexible, as changes can be made independently for each instance.
		- Less memory usage, as only a single new object is created.
	+ Cons:
		- Slower execution due to the overhead of creating a new object and binding methods to it.
		- Potential performance issues if multiple instances are created with the same properties.

**Library usage:**
There is no library used in this benchmark. The `String` prototype is being modified directly.

**Special JavaScript features or syntax:**
The benchmark uses the following special features:

* `charCodeAt(0).toString(2)` and `charCodeAt(0).toString(8)` are using binary and hexadecimal representations of Unicode characters, respectively.
* The `for...of` loop in the benchmark's script preparation code is not used. However, if it were to be replaced with an array-based implementation, it would likely involve a similar loop.

**Alternatives:**
Other approaches could include:

* Creating a new class that extends `String` and adds the desired methods.
* Using a utility library like Lodash or Ramda to add methods to strings without modifying the prototype.
* Implementing the methods directly in the JavaScript engine or using native code (if available) for optimal performance.

The benchmark allows users to compare these approaches and choose the one that best suits their needs.

Related benchmarks:

Object.assign vs prototype (version: 0)

Comparing performance of: Extend prototype vs Object.assign

Created: 9 years ago by: Guest

Jump to the latest result

Extend prototype

Object.assign

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):