Benchmark Overview

The provided JSON represents a JavaScript microbenchmark that compares the performance of two data structures: Object.fromEntries and Map. The benchmark is designed to measure which approach is faster for creating an object from an array of key-value pairs.

Script Preparation Code

The script preparation code creates a dataset by:

1. Generating an array of 10,000 keys using Array.from(Array(10000).keys()).
2. Creating an array of equivalent key-value pairs using Object.entries.

The resulting data is then passed to both the Object.fromEntries and Map methods.

Options Compared

Two options are compared in this benchmark:

1. Object.fromEntries: This method creates a new object by taking an iterable of key-value pairs as an argument.
2. Map: A built-in JavaScript data structure that stores key-value pairs in an ordered collection.

Pros and Cons of Each Approach

• Object.fromEntries:
  • Pros:
    • More intuitive for creating objects with named properties (e.g., const obj = Object.fromEntries([...])).
    • Can be more readable for simple cases.
  • Cons:
    • May have slower performance due to the overhead of object creation and property access.
• Map:
  • Pros:
    • Often faster than Object.fromEntries because it avoids the overhead of object creation and property access.
    • More efficient for large datasets or when working with multiple key-value pairs.
  • Cons:
    • Less intuitive for creating objects with named properties (e.g., const obj = new Map([...])).

Library/Function Used

None, as both methods are built into JavaScript.

Special JS Feature/Syntax

No special features or syntax are used in this benchmark. However, if you're interested in exploring other performance comparisons, MeasureThat.net also tests various other JavaScript methods and libraries.

Other Alternatives

If you're looking for alternatives to Object.fromEntries and Map, consider the following:

• For creating objects:
  • JSON.parse(JSON.stringify(data)): A simple way to create an object from a JSON-like data structure.
  • Array.prototype.reduce(): Can be used to create an object by reducing an array of key-value pairs.
• For working with key-value pairs:
  • Array.prototype.forEach(): Can be used to iterate over key-value pairs in an array.
  • Set or Map alternatives, such as Array.prototype.reduce() or third-party libraries like Lodash.

Keep in mind that the choice of method depends on your specific use case and requirements.