Benchmark: Json parse vs string split

Script Preparation code:

var json = '[["281","LIZRD","0","a22b6d6cb63a83","00000000000000","f60cb4293a1077","3653"],["282","LIZRD","0","a22b6d6cb63a83","00000000000000","f60cb4293a1077","3654"]]'
var str = '281,LIZRD,0,a22b6d6cb63a83,00000000000000,f60cb4293a1077,3653;282,LIZRD,0,a22b6d6cb63a83,00000000000000,f60cb4293a1077,3654'

Tests:

parse json
JSON.parse(json)
parse str
str.split(';').map((p)=>{p.split(',')})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parse json
parse str

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0

Browser/OS: Firefox 139 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
parse json	4144393.8 Ops/sec
parse str	3684340.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark.

**Benchmark Definition**

The benchmark measures the performance difference between two approaches:

1. **JSON.parse(json)**: This method parses a JSON string into a JavaScript object.
2. **str.split(';').map((p)=>{p.split(',')})**: This approach splits a comma-separated string into an array using the `split()` method with ';' as the separator, and then maps each element to another array by splitting it at commas.

**Options Compared**

The benchmark compares these two approaches:

* **JSON.parse(json)**: A native JavaScript method for parsing JSON strings.
* **str.split(';').map((p)=>{p.split(',')})**: An imperative approach using the `split()` method and a closure (the anonymous function).

**Pros and Cons of Each Approach**

* **JSON.parse(json)**
	+ Pros:
		- Native implementation, optimized for performance.
		- Easy to read and maintain code.
	+ Cons:
		- Requires JavaScript objects and JSON syntax knowledge.
		- May be slower due to the overhead of parsing JSON.
* **str.split(';').map((p)=>{p.split(',')})**
	+ Pros:
		- Does not require additional libraries or knowledge.
		- Can be optimized for performance by using a single `split()` call with ';'.
	+ Cons:
		- Requires manual handling of array splitting and mapping.
		- May have performance overhead due to the use of multiple `split()` calls.

**Library Used**

There is no explicit library mentioned in the benchmark definition. However, the `JSON.parse()` method uses the built-in JSON parser, which is a standard part of JavaScript.

**Special JS Feature or Syntax**

The benchmark does not explicitly mention any special JavaScript features or syntax beyond the use of JSON and array manipulation. If it did, I'd be happy to explain it!

**Other Alternatives**

If you're looking for alternative approaches to parse arrays in JavaScript, some options include:

1. **Array.from()**: Can be used to create an array from a string by splitting it at commas.
2. **split() with a callback function**: Similar to the imperative approach used in the benchmark, but can be more concise and efficient.

For example:
```javascript
var str = '281,LIZRD,0,a22b6d6cb63a83,00000000000000,f60cb4293a1077,3653;282,LIZRD,0,a22b6d6cb63a83,00000000000000,f60cb4293a1077,3654';
var array = str.split(';').map(str => str.split(','));
```
Keep in mind that the performance characteristics of these alternatives may vary depending on your specific use case and requirements.

Related benchmarks:

Json parse vs string split (version: 0)

Test best way to transfer simple arrays

Comparing performance of: parse json vs parse str

Created: 4 years ago by: Guest

Jump to the latest result

parse json

parse str

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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