Benchmark: JSON.parse vs string.split 1

Script Preparation code:

var array = new Array(25000).fill('1').map(() => Math.random().toString());
var str = JSON.stringify(array);

Tests:

JSON.parse
JSON.parse(str);
String.split
str.split(',')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.parse
String.split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.0.0 Safari/537.36

Browser/OS: Chrome 101 on Windows

View result in a separate tab

Test name	Executions per second
JSON.parse	852.4 Ops/sec
String.split	1430.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its related information.

**What is being tested?**

The benchmark is testing two different approaches to split a string into an array: `string.split()` and `JSON.parse()`. Specifically, it's comparing the performance of these two methods on a large string containing 25,000 random numbers converted to strings using `Math.random().toString()`.

**Options compared:**

1. **`String.split(',')`**: This method splits the input string into an array at each occurrence of the comma character (`,`). It returns an array of substrings.
2. **`JSON.parse(str)`**: This method parses a JSON string and converts it to a JavaScript object. In this case, it's being used to split the input string into an array.

**Pros and Cons:**

1. **`String.split(',')`**:
	* Pros:
		+ Fast and efficient, as it uses a built-in JavaScript method.
		+ Easy to implement and understand.
	* Cons:
		+ May not work correctly if the comma characters are within quotes or other special characters.
2. **`JSON.parse(str)`**:
	* Pros:
		+ Can handle more complex string formats, such as strings with quotes or escaped characters.
	* Cons:
		+ Slower than `String.split(',')`, as it requires parsing a JSON string.

**Library and purpose:**

The `JSON` library is part of the JavaScript Standard Library. It provides functions for working with JSON data, including `JSON.parse()`.

**Special JS feature or syntax:**

This benchmark doesn't require any special JavaScript features or syntax beyond what's available in modern browsers. However, it does use a few standard JavaScript techniques, such as:

* Creating an array using the `Array` constructor and `fill()`
* Using the `map()` method to create a new array
* Stringifying an object using `JSON.stringify()`

**Other alternatives:**

If you need to split a string into an array, you could also use other methods, such as:

* Using a regular expression with the `match()` or `matchAll()` methods.
* Implementing your own custom splitting logic using loops and conditional statements.

Here's an example of how you might use a regular expression to split a string:
```javascript
const str = 'a,b,c,d,e';
const arr = str.split(/,/).map((val) => val.trim());
console.log(arr); // Output: ['a', 'b', 'c', 'd', 'e']
```
Keep in mind that the choice of method will depend on the specific requirements and constraints of your project.

Related benchmarks:

JSON.parse vs string.split 1 (version: 0)

Comparing performance of: JSON.parse vs String.split

Created: 3 years ago by: Guest

Jump to the latest result

JSON.parse

String.split

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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