Benchmark: JSON.parse vs Object.values

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var arrayOf1kkNumbers = new Array(1000000).fill(1).map((_,index) => index);
var stringOfArray = JSON.stringify(arrayOf1kkNumbers)
var objectOfArray = arrayOf1kkNumbers.reduce((acc, cur, index) => {
  acc[index] = cur
  return acc
}, {})

Tests:

JSON.parse
const jsonParse = JSON.parse(stringOfArray)
Object.values
const objectValues = Object.values(objectOfArray)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.parse
Object.values

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36

Browser/OS: Chrome 97 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
JSON.parse	54.5 Ops/sec
Object.values	446.7 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 JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing two approaches:

1. `JSON.parse(stringOfArray)`: This method parses a JSON string into a JavaScript object.
2. `Object.values(objectOfArray)`: This method returns an array of values from a JavaScript object.

**Script Preparation Code**

The script preparation code generates a large array of 1 million numbers, converts it to a JSON string using `JSON.stringify()`, and then creates a corresponding JavaScript object by reducing the array into a single-level object using `reduce()`.

**Html Preparation Code**

The HTML preparation code includes a reference to Lodash library version 4.17.5, which is used for its utility functions.

**Test Cases**

There are two individual test cases:

1. `JSON.parse(stringOfArray)`: This test case uses the `JSON.parse()` method to parse the generated JSON string into a JavaScript object.
2. `Object.values(objectOfArray)`: This test case uses the `Object.values()` method to extract an array of values from the generated JavaScript object.

**Pros and Cons**

Here are some pros and cons for each approach:

* `JSON.parse(stringOfArray)`:
	+ Pros: This method is widely supported by most modern browsers and is relatively simple to implement.
	+ Cons: It may be slower than other methods due to the overhead of parsing a JSON string, especially for large inputs.
* `Object.values(objectOfArray)`: 
	+ Pros: This method is often faster than `JSON.parse()` because it doesn't require parsing a JSON string. Additionally, it can take advantage of browser optimizations for accessing object properties directly.
	+ Cons: This method requires the JavaScript object to be available, which may not always be the case (e.g., if the object is only accessible through a closure or another mechanism). Also, some browsers might have issues with this method.

**Library and Syntax Considerations**

* Lodash library: In this benchmark, Lodash is used for its utility functions, specifically for creating an empty object `objectOfArray` using the `reduce()` method.
* Special JS feature: This benchmark does not explicitly use any special JavaScript features or syntax. However, it assumes that the browser supports modern ECMAScript standards and has optimizations in place for accessing object properties.

**Alternatives**

Other alternatives to these approaches could include:

* Using a dedicated JSON parser library like FastJSON or JSON-Parse
* Implementing a custom parser using regular expressions or other techniques
* Using other methods, such as `at()`, `in()` or `hasOwnProperty()` to access the object properties

However, these alternatives might not be suitable for this specific benchmark due to their differences in performance, compatibility and functionality.

Related benchmarks:

JSON.parse vs Object.values (version: 0)

Comparing performance of: JSON.parse vs Object.values

Created: 2 years ago by: Guest

Jump to the latest result

JSON.parse

Object.values

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):