What is being tested?

MeasureThat.net is testing the performance of two approaches to merge objects in JavaScript: Object.assign() and the spread operator (...).

Options being compared

The benchmark is comparing the performance of:

1. Object.assign()
2. The spread operator (...)

Pros and Cons of each approach

1. Object.assign()
   • Pros:
     • Widely supported in older browsers (IE 9+)
     • Simple to use
   • Cons:
     • Performance is generally slower compared to the spread operator
2. The spread operator (...)
   • Pros:
     • Faster performance compared to Object.assign()
     • More modern and widely supported in modern browsers (IE 11+, Chrome 44+, Firefox 35+, Edge 14+)
   • Cons:
     • Introduced in ECMAScript 2018, so not compatible with older JavaScript versions
     • May require a more recent browser or transpiler to work

Library and its purpose

None are mentioned in the provided benchmark definition.

Special JS feature or syntax

The spread operator (...) is a relatively new feature introduced in ECMAScript 2018. It allows object destructuring and merging.

Benchmark preparation code

The script preparation code is empty, which means that no specific setup or initialization code is required to run the benchmark.

Other alternatives

If you want to test other approaches to merge objects, some examples include:

• Using concat() to concatenate two arrays
• Using a library like Lodash's merge function
• Using a simple loop to iterate over properties and assign values

However, these alternatives are not mentioned in the provided benchmark definition.

Benchmark result

The latest benchmark result shows that the spread operator (...) outperforms Object.assign() in this specific test case.