Benchmark: Object.hasOwnProperty vs Object in vs Object[] vs Array.indexOf vs Array.includes

Script Preparation code:

  var object = {},
      array = [],
      i, test = 500;
  
  for (i = 0; i < 1000; i++) {
   object['something' + i] = true;
   array.push('something' + i);
  }

Tests:

Object.hasOwnProperty
object.hasOwnProperty('something' + test)
Object in
('something' + test) in object
Array.indexOf
array.indexOf('something' + test) !== -1
direct
object['something' + test] === true
Array includes
array.includes('something' + test)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.hasOwnProperty
Object in
Array.indexOf
direct
Array includes

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested on the provided JSON.

**Benchmark Overview**

The benchmark measures the performance of different ways to check if an object has a property or if a value exists in an array. The test cases compare:

1. `Object.hasOwnProperty`
2. `Object in` (a non-standard operator)
3. `Array.indexOf` with a negative result indicating absence
4. Direct access using bracket notation (`object['something' + test] === true`)
5. `Array.includes`

**Options Compared**

The benchmark compares the performance of each option on different browsers, devices, and operating systems.

**Pros and Cons of Each Approach**

1. **Object.hasOwnProperty**
	* Pros: Simple, efficient, and widely supported.
	* Cons: May be slower than other options for certain edge cases or modern browsers.
2. **Object in**
	* Pros: Non-standard operator makes it unique and potentially faster due to compiler optimizations.
	* Cons: Not widely supported (only available in ECMAScript 2020+) and may not work well with older browsers.
3. **Array.indexOf** (with negative result)
	* Pros: Fast and efficient, as it uses optimized native functions.
	* Cons: May be slower than other options for small arrays or specific use cases.
4. **Direct Access**
	* Pros: Simple and efficient, but may not work well with large objects or complex data structures.
	* Cons: Can lead to slow performance if the object is large or has many properties.
5. **Array.includes**
	* Pros: Fast and efficient, as it uses optimized native functions.
	* Cons: May be slower than `Array.indexOf` for certain edge cases.

**Library and Syntax Used**

The benchmark uses the following libraries and syntax:

* No explicit library imports; however, it assumes standard JavaScript functionality.
* Uses non-standard operator (`Object in`) which is only available in ECMAScript 2020+.

**Special JS Feature or Syntax**

The benchmark uses a non-standard operator (`Object in`), which was introduced in ECMAScript 2019. This makes the benchmark more modern and potentially faster, but it may not work well with older browsers.

**Other Alternatives**

If you're looking for alternative approaches to this benchmark, consider:

* Using `in` or `hasOwnProperty` instead of `Object.hasOwnProperty`
* Using `Array.prototype.includes()` or `Array.prototype.indexOf()` instead of `Array.indexOf()`
* Implementing custom optimization techniques, such as using a hash table or caching results

Keep in mind that the performance differences between these approaches may vary depending on the specific use case and browser environment.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0

Browser/OS: Firefox 52 on Windows XP

View result in a separate tab

Test name	Executions per second
Object.hasOwnProperty	1061415.1 Ops/sec
Object in	975346.4 Ops/sec
Array.indexOf	16290.5 Ops/sec
direct	1785414.6 Ops/sec
Array includes	18477.4 Ops/sec

Related benchmarks:

Object.hasOwnProperty vs Object in vs Object[] vs Array.indexOf vs Array.includes (version: 0)

Comparing performance of: Object.hasOwnProperty vs Object in vs Array.indexOf vs direct vs Array includes

Created: 7 years ago by: Guest

Jump to the latest result

Object.hasOwnProperty

Object in

Array.indexOf

direct

Array includes

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):