Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

Benchmark Overview

The provided benchmark measures the performance of three different approaches to conditionally insert properties into an object:

1. Boring: A simple if-else statement that checks a random value and inserts a property if it's true.
2. Spread: An object spread operator ( ... ) that conditionally adds a new object to the existing one.
3. Object.assign: The Object.assign() method used with an initial object and a conditional assignment.

Options Compared

These three approaches are compared in terms of their performance, which is measured by the number of executions per second on a specific device (Firefox Mobile 88, Android 11).

Pros and Cons of Each Approach

1. Boring:
   • Pros: Simple to understand, easy to implement.
   • Cons: May lead to unnecessary property assignments if the condition is false.
2. Spread:
   • Pros: Concise syntax, readable code.
   • Cons: Some older browsers might not support the object spread operator, and it may be slower due to the additional overhead of creating a new object.
3. Object.assign:
   • Pros: Well-established method with good browser support, flexible assignment options.
   • Cons: Can lead to unnecessary property assignments if the condition is false.

Library/Functionality Used

In this benchmark, there are no specific libraries used beyond the built-in JavaScript functions and methods mentioned above. However, it's worth noting that some browsers may have additional features or optimizations enabled in their implementations of these functions (e.g., Firefox has a custom implementation of Object.assign()).

Special JS Features/Syntax

None of the benchmark cases use special JavaScript features or syntax beyond what's covered by the standard language specification.

Other Alternatives

If you're looking for alternatives to these approaches, consider:

1. Object.create(): Creates an object with a given prototype and assigns properties conditionally.
2. Array.prototype.push(): Pushes new elements onto an array conditionally, though this approach might be less common than the others mentioned here.

For more information on measuring JavaScript performance or creating microbenchmarks, MeasureThat.net offers various resources and guides to help you get started.