Benchmark: Checking property existence

Script Preparation code:

  var props = {};
  var test = 1000;
  
  for (let i = 0; i < 1000; i++) {
   props['something' + i] = true;
  }

Tests:

Object.hasOwnProperty
props.hasOwnProperty('something' + test)
Object in
('something' + test) in props
Index
props['something' + test]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.hasOwnProperty
Object in
Index

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark created on the MeasureThat.net website. The benchmark tests three different approaches for checking property existence in an object.

**Script Preparation Code**

The script preparation code defines two variables: `props` and `test`. `props` is initialized as an empty object, while `test` is set to 1000. The script then loops 1000 times, adding properties to the `props` object using a dynamic key that concatenates the loop index (`i`) with the string `'something'`.

**Html Preparation Code**

There is no HTML preparation code provided, which means that the benchmark is purely JavaScript-based.

**Test Cases**

The benchmark consists of three test cases:

1. **Object.hasOwnProperty**: This test checks if the `props` object has a property with the key generated by concatenating `test` with `'something'`. This approach uses the `hasOwnProperty` method, which returns a boolean value indicating whether the specified property exists in the object.
2. **Object in**: This test checks if the `props` object contains a property with the key generated by concatenating `test` with `'something'`. This approach uses the `in` operator, which returns a boolean value indicating whether the specified property is present in the object.
3. **Index**: This test directly accesses the property of `props` using the dynamically generated key.

**Library and Special Features**

None of the provided code snippets use any external libraries or special JavaScript features beyond the standard syntax and built-in methods like `hasOwnProperty` and the `in` operator.

**Options Compared**

The benchmark compares three different approaches for checking property existence:

1. **Object.hasOwnProperty**: Uses the `hasOwnProperty` method to check if a property exists in the object.
2. **Object in**: Uses the `in` operator to check if a property is present in the object.
3. **Index**: Directly accesses the property using its dynamically generated key.

**Pros and Cons**

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

1. **Object.hasOwnProperty**:
	* Pros: Can provide more accurate results, as `hasOwnProperty` only checks if the property exists in the object's own property table.
	* Cons: May have slower performance due to the method call overhead.
2. **Object in**:
	* Pros: Often faster and more efficient than using `hasOwnProperty`, as it can use a single operation to check multiple properties.
	* Cons: May return false positives if the object contains other properties with the same name, or if the property is inherited from a prototype chain.
3. **Index**:
	* Pros: Can be faster and more straightforward for simple cases, as it directly accesses the property without any method calls.
	* Cons: May not work correctly in all scenarios, such as when the property doesn't exist, or if the object's structure changes dynamically.

**Other Alternatives**

Some alternative approaches to checking property existence could include:

1. Using a library like Lodash or Ramda, which provide optimized and efficient methods for checking property existence.
2. Utilizing advanced JavaScript features like `Map` or `WeakMap`, which can provide faster and more efficient ways to check property existence.
3. Implementing custom optimizations using specialized data structures or algorithms.

Keep in mind that the choice of approach ultimately depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

Checking property existence (version: 1)

Comparing performance of: Object.hasOwnProperty vs Object in vs Index

Created: 6 years ago by: Registered User

Jump to the latest result

Object.hasOwnProperty

Object in

Index

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):