Benchmark: Adding random property in array.

Tests:

Add array item
const a = [1, 2, 3]; a[3] = 4
Add random property
const a = [1, 2, 3]; a.metadata = 4;
No addition
const a = [1, 2, 3, 4];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Add array item
Add random property
No addition

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36

Browser/OS: Chrome 87 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Add array item	49185528.0 Ops/sec
Add random property	874934144.0 Ops/sec
No addition	897159168.0 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 test cases and explain what's being tested.

**Benchmark Definition JSON**

The benchmark definition is an empty object, which means that the script preparation code and HTML preparation code are not required for this specific benchmark. The script will be executed directly in the browser, and the results will be measured.

**Individual Test Cases**

There are three test cases:

1. **"Add array item"`**
	* Benchmark Definition: `const a = [1, 2, 3];\r\na[3]  = 4`
	* This test case is designed to measure the performance of adding an element at a specific index in an array using bracket notation.
2. **"Add random property"`**
	* Benchmark Definition: `const a = [1, 2, 3];\r\na.metadata = 4;`
	* This test case is designed to measure the performance of setting a new property on an object (in this case, an array) using dot notation.
3. **"No addition"`**
	* Benchmark Definition: `const a = [1, 2, 3, 4];`
	* This test case is a control case that measures the baseline execution time of simply creating an array.

**Options Compared**

In this benchmark, two different approaches are compared:

1. **Bracket notation (`a[3] = 4`)**: This approach uses bracket notation to access and modify the array element.
2. **Dot notation (`a.metadata = 4`)**: This approach uses dot notation to access and modify a new property on the object.

**Pros and Cons**

* Bracket notation:
	+ Pros: concise, efficient way to access array elements
	+ Cons: can be less readable for complex or nested arrays
* Dot notation:
	+ Pros: more explicit and readable way to set properties on objects
	+ Cons: may be slower due to the overhead of creating a new property

**Library Usage**

There is no library usage in these test cases. The script execution will rely solely on the JavaScript engine.

**Special JS Features or Syntax**

None of these test cases use any special JavaScript features or syntax that would require additional explanation.

**Other Alternatives**

If you want to measure performance differences between these approaches, you might consider using:

* Using `Array.prototype.splice()` instead of bracket notation
* Using a library like Lodash or Ramda to perform array operations
* Using a different data structure, such as an object with nested properties

However, for this specific benchmark, the focus is on measuring the performance difference between bracket notation and dot notation, so these alternatives might not be relevant.

Related benchmarks:

Adding random property in array. (version: 1)

Comparing performance of: Add array item vs Add random property vs No addition

Created: 4 years ago by: Registered User

Jump to the latest result

Add array item

Add random property

No addition

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):