Benchmark: JSON.parse vs string.split small array

Script Preparation code:

var array = new Array(3).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: 23 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
JSON.parse	5100199.5 Ops/sec
String.split	7842466.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and other considerations.

**Benchmark Definition**

The benchmark is defined in JSON format, which includes:

* `Name`: A unique name for the benchmark.
* `Description`: An optional description of the benchmark. In this case, it's empty.
* `Script Preparation Code`:
	+ Creates a small array with three random strings using `Array(3).fill('1').map(() => Math.random().toString())`.
	+ Converts the array to a JSON string using `JSON.stringify(array)`.
* `Html Preparation Code`: An empty string, indicating that no HTML preparation is needed.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **`JSON.parse(str)`**: Tests the performance of parsing a JSON string.
2. **`str.split(',')```**: Tests the performance of splitting a string by commas using `String.split()`.

**What's being tested?**

Both test cases measure the execution time of their respective functions, comparing their performance in terms of "Executions Per Second".

**Comparison**

The comparison is between the execution times of:

1. `JSON.parse(str)`: Parses a JSON string into a JavaScript object.
2. `str.split(',')`: Splits a string by commas and returns an array of substrings.

**Options compared**

The options being compared are:

* **Parsing vs Splitting**: Two different approaches to processing strings: parsing (JSON) vs splitting (by comma).

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **`JSON.parse(str)`**:
	* Pros:
		+ Handles nested data structures more robustly.
		+ Returns an object, which can be more convenient for further processing.
	* Cons:
		+ May incur higher overhead due to parsing logic.
2. **`str.split(',')```**:
	* Pros:
		+ Lightweight and fast, as it only requires string manipulation.
	* Cons:
		+ Does not handle nested data structures well.
		+ Returns an array of substrings instead of a single object.

**Library used**

In this benchmark, the `JSON` library is implicitly used for parsing JSON strings. The `String` library is also used for splitting strings by commas.

**Special JS feature or syntax**

There are no special JavaScript features or syntaxes mentioned in the benchmark definition or test cases.

**Other alternatives**

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

* **Regular expressions**: You could use regular expressions to split strings by commas instead of `String.split()`.
* **Native array methods**: If the input data is mostly numeric, you might consider using native array methods like `map()` or `filter()` for splitting and parsing.
* **Third-party libraries**: Depending on your specific requirements, you might want to explore third-party libraries like Lodash (for `_.split()`) or JSON parsing libraries like json-parse (a lighter alternative to the built-in `JSON.parse()` method).

Keep in mind that these alternatives may have different performance characteristics, trade-offs, and use cases compared to the original benchmark.

Related benchmarks:

JSON.parse vs string.split small array (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):