Benchmark: Object.toString custom vs JSON.stringify

Script Preparation code:

window.a = {
 x: 1,
 y: 2,

 toString() {
	return "{" + Object.entries(this).reduce((acc, [key, val]) => acc += key !== "toString" ? `"${key}":${val},` : "", "") + "}";
 }
}

Tests:

String
console.log(String(a));
JSON
console.log(JSON.stringify(a));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String
JSON

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'd be happy to explain what's being tested in this benchmark.

**Benchmark Overview**

The benchmark is comparing the performance of two approaches: using `Object.toString()` and `JSON.stringify()` on a custom JavaScript object.

**Test Object**

A custom JavaScript object named "a" is created with two properties: `x` and `y`. The object has a custom implementation of the `toString()` method, which returns a string representation of the object in a specific format. This format includes property names and values separated by commas, wrapped in double quotes.

**Comparison**

The benchmark consists of two test cases:

1. **String**: This test case measures the performance of using `console.log(String(a))`.
2. **JSON**: This test case measures the performance of using `console.log(JSON.stringify(a))`.

**Options Compared**

The options being compared are:

* Using `Object.toString()` to convert the object to a string
* Using `JSON.stringify()` to convert the object to a JSON string

**Pros and Cons**

Using `Object.toString()```:

Pros:

* Provides a more human-readable representation of the object
* Can be useful for debugging purposes

Cons:

* May not be as efficient as `JSON.stringify()` due to its custom implementation
* Can lead to performance issues if not optimized properly

Using `JSON.stringify()``:

Pros:

* More efficient and faster than `Object.toString()`
* Standardized and widely supported by browsers and other environments

Cons:

* May not provide the same level of human-readability as `Object.toString()`

**Library Used**

The `JSON` library is used for its standardized and efficient way of converting objects to JSON strings. The `JSON.stringify()` method takes an object as input and returns a string representation of that object.

**Special JS Feature/Syntax**

None mentioned in this benchmark, but it's worth noting that the custom implementation of `toString()` on the "a" object is using some advanced JavaScript features, such as:

* Template literals (`\"${key}\":${val},`)
* Array methods (`reduce()`, `[key, val]`)

However, these are not highlighted as special features in this benchmark.

**Alternatives**

Other alternatives for converting objects to strings or JSON strings include:

* Using `Array.prototype.join()` with a custom separator
* Using a library like Lodash's `toJSON()` function
* Writing a custom implementation using recursion and string concatenation

However, the use of `Object.toString()` and `JSON.stringify()` are widely supported and efficient ways to achieve this goal.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0

Browser/OS: Firefox 95 on Windows 7

View result in a separate tab

Test name	Executions per second
String	61441.5 Ops/sec
JSON	63530.9 Ops/sec

Related benchmarks:

Object.toString custom vs JSON.stringify (version: 0)

Comparing performance of: String vs JSON

Created: 2 years ago by: Guest

Jump to the latest result

String

JSON

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):