Let's dive into the world of MeasureThat.net and analyze the provided benchmark.

What is tested?

The benchmark compares two approaches for concatenating arrays: Array.prototype.concat (the traditional method) and the ES6 spread operator (...).

Options compared

• Option 1: Array.prototype.concat
  • This method creates a new array by copying elements from the original array (params) and another array ([1, 2]). It's a widely supported method in JavaScript.
• Option 2: ES6 spread operator (...)
  • This method creates a new array by spreading the elements of the params array into the existing array ([1, 2]). It's a concise and modern way to concatenate arrays.

Pros and Cons

• Option 1 (Array.prototype.concat)
  • Pros:
    • Well-supported in older browsers
    • Can be used with other methods like push() or slice()
  • Cons:
    • Creates a new array, which can lead to increased memory usage
    • Less concise than the spread operator
• Option 2 (ES6 spread operator)
  • Pros:
    • Concise and easy to read
    • More modern and efficient than concat()
  • Cons:
    • Not supported in older browsers (not recommended for compatibility reasons)
    • May not work as expected with certain types of arrays or data structures

Library usage

The benchmark doesn't use any external libraries. However, it's worth noting that some JavaScript engines may have their own internal optimizations or implementations of the spread operator.

Special JS features or syntax

• The ES6 spread operator (...) is a feature introduced in ECMAScript 2015 (ES6). It's designed to make array manipulation more concise and expressive.
• concat() is a native JavaScript method that has been part of the language since its inception. However, it may not be as efficient or readable as the spread operator.

Other alternatives

If you want to explore alternative approaches, here are a few options:

• Array.prototype.push(): You can use push() to add elements to an array and then return the resulting array.
• slice(): You can use slice() to create a new array with a subset of elements from another array.
• Custom implementation: If you need more control over the concatenation process, you can implement your own custom function using loops or recursion.

In summary, the benchmark compares two widely used methods for concatenating arrays: Array.prototype.concat and the ES6 spread operator. The spread operator is a concise and modern way to concatenate arrays, but it may not be supported in older browsers.