Benchmark: tevecsiga - MeasureThat.net

Script Preparation code:

  var object = {},
      array = [],
      i, test = 1000000;
  
  for (i = 0; i < 1000000; 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

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark test.

**Benchmark Test Overview**

The test is designed to measure the performance differences between various approaches for checking if a value exists in an object or array in JavaScript. The test cases are:

1. `object.hasOwnProperty('something' + test)`
2. `'something' + test` in `object`
3. `array.indexOf('something' + test) !== -1`
4. `object['something' + test] === true`
5. `array.includes('something' + test)`

**What is being tested?**

These five approaches are compared to determine which one is the fastest. The test creates a large object and array, populates them with millions of entries, and then checks if each entry exists using one of these five methods.

**Options Compared**

Here's a brief overview of each approach:

1. `object.hasOwnProperty('something' + test)`: This method checks if the object has a property with the given key.
2. `'something' + test` in `object`: This method uses the `in` operator to check if the key is present in the object.
3. `array.indexOf('something' + test) !== -1`: This method searches for the key in the array using the `indexOf` method and checks if it returns a non-negative index (i.e., not -1).
4. `object['something' + test] === true`: This method directly accesses the property value of the object.
5. `array.includes('something' + test)`: This method uses the `includes` method to check if the array contains the given element.

**Pros and Cons**

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

1. `object.hasOwnProperty('something' + test)`:
	* Pros: Fast and efficient, as it directly checks the object's property existence.
	* Cons: May not work as expected if the key is not present, causing a TypeError.
2. `'something' + test` in `object`:
	* Pros: Works even if the key is not present, returning `false`. Can be useful for checking if a value exists.
	* Cons: May be slower than other methods due to the use of the `in` operator.
3. `array.indexOf('something' + test) !== -1`:
	* Pros: Fast and efficient, as it uses binary search under the hood.
	* Cons: May return -1 if the element is not found, which can be misleading.
4. `object['something' + test] === true`:
	* Pros: Directly accesses the property value, which can be useful for some use cases.
	* Cons: May cause errors if the key is not present or is a reserved word.
5. `array.includes('something' + test)`:
	* Pros: Fast and efficient, as it uses a simple linear search under the hood (in modern browsers).
	* Cons: May be slower than other methods due to the overhead of creating a new array.

**Library Usage**

None of these approaches rely on any external libraries or modules. They are built-in JavaScript operators or methods.

**Special JS Features**

The test uses some special JavaScript features, such as:

1. Template literals (`'something' + test`)
2. The `in` operator
3. Array methods (`indexOf`, `includes`)

These features are widely supported in modern browsers and are not specific to any particular platform or environment.

**Alternatives**

Other alternatives for checking if a value exists in an object or array include:

1. Using the `Object.keys()` method to iterate over the object's properties.
2. Using a library like Lodash, which provides a `some()` function for iterating over arrays and objects.
3. Using a custom implementation using bitwise operations (e.g., checking if a value is present in an array using a boolean flag).

Keep in mind that these alternatives may have different performance characteristics or trade-offs compared to the methods used in this benchmark test.

Related benchmarks:

tevecsiga (version: 0)

Object.hasOwnProperty vs Object in vs Array.indexOf vs direct vs Array includes

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

Created: 4 years ago by: Guest

Jump to the latest result

Object.hasOwnProperty

Object in

Array.indexOf

direct

Array includes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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