Benchmark Overview

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks to compare the performance of different approaches. The benchmark in question tests five methods for checking if a property exists or can be found within an object, array, or array with indexOf method.

Tested Approaches

The test compares the following approaches:

1. Object.hasOwnProperty
2. Object in
3. Array.indexOf !== -1
4. direct: A simple property access using bracket notation (object['something' + test] === true)
5. Array includes: Using the includes method to check if an element exists in an array

Options Compared

The test compares the performance of these five approaches on a large dataset of 50,000 objects and 50,000 elements.

Pros and Cons of Each Approach:

1. Object.hasOwnProperty:
   • Pros: Simple and efficient, as it only checks if the property exists in the object.
   • Cons: May be slower than other methods for very large datasets due to its simplicity.
2. Object in:
   • Pros: Similar to hasOwnProperty, but with a slightly more modern syntax.
   • Cons: May have similar performance characteristics as hasOwnProperty.
3. Array.indexOf !== -1:
   • Pros: Can be faster than other methods for large datasets, as it uses an index-based approach.
   • Cons: May be slower for very small datasets due to the overhead of searching for the index.
4. direct:
   • Pros: Simple and efficient, with minimal overhead.
   • Cons: May not be suitable for very large datasets or objects with many properties.
5. Array includes:
   • Pros: Modern syntax and relatively fast performance.
   • Cons: May have slightly slower performance than indexOf !== -1 due to the overhead of regular expressions.

Library Used

The test uses no external libraries beyond standard JavaScript features.

Special JS Features or Syntax

None mentioned, but it's worth noting that some browsers may optimize certain methods using WebAssembly or other advanced technologies.

Alternatives

Other approaches could be used for this benchmark, such as:

• Using a library like Lodash with has function
• Implementing a custom hash table or data structure to store and query objects and arrays
• Using a different data structure, like a sparse array or an object with optimized property access

However, these alternatives are not tested in the provided benchmark.