Benchmark Overview

MeasureThat.net is a website where users can create and run JavaScript microbenchmarks to compare the performance of different approaches in various scenarios. The benchmark you provided tests four individual test cases:

1. "Deleted": Measures the performance of Object.entries(objA) after deleting properties from object objA.
2. "Set undefined": Measures the performance of Object.entries(objB) after setting properties in object objB to undefined.
3. "Iterate deleted": Measures the performance of iterating over object objA using a for...in loop after deleting its properties.
4. "Iterate set undefined": Measures the performance of iterating over object objB using a for...in loop after setting its properties to undefined.

Options Compared

The benchmark compares four options:

1. Deleted: Delete properties from object objA before measuring the performance of Object.entries(objA).
2. Set undefined: Set properties in object objB to undefined before measuring the performance of Object.entries(objB).

Pros and Cons

• Deleted:
  • Pros: This approach simulates a common scenario where an object's properties are deleted, which can affect the performance of subsequent operations.
  • Cons: Deleting properties can lead to memory fragmentation and potentially slow down garbage collection.
• Set undefined: This approach simulates setting properties to undefined, which is a common operation in JavaScript. However, it may not accurately represent real-world scenarios where objects are modified frequently.

Library

In the benchmark preparation code, the following library is used:

• None explicitly mentioned, but the Object.entries() method is used, which is a built-in method of the Object class.

Special JS Features or Syntax

The benchmark uses the doNothing function, which is defined in the script preparation code. However, there is no indication that this function does anything specific or special beyond simply not doing anything (hence the name).

Other Alternatives

To run this benchmark, you can create a new benchmark on MeasureThat.net and paste the provided JSON data into the "Benchmark Definition" field. You will also need to provide your own script preparation code, which should include the doNothing function.

If you want to run similar benchmarks, you can try:

• Using different browsers or versions
• Testing other object methods, such as Object.keys() or JSON.stringify()
• Simulating different scenarios, such as adding or removing properties from an object