Let's dive into the benchmark.

What is being tested?

MeasureThat.net is comparing three approaches to concatenate arrays:

1. Array.prototype.concat(): A traditional method that uses the concat() function on the Array prototype.
2. Spread operator (...): A new ES6 feature that allows spreading an array's elements into a new array using the syntax new Array([...]).push(...) or simply [...array].
3. jQuery merge: Using the $.merge() function from jQuery to concatenate arrays.

Options comparison

The three options are being compared in terms of performance, which is typically measured as the number of executions per second (ExecutionsPerSecond).

• Array.prototype.concat(): This method creates a new array and then pushes each element from the original array into it. It's a simple but potentially slow approach.
• Spread operator (...): This method is generally faster because it only requires a single operation to create a new array with the spread elements.
• jQuery merge: jQuery provides its own implementation of array concatenation, which might be optimized for performance.

Pros and Cons

Here's a brief summary:

• Array.prototype.concat():
  • Pros: Simple to implement, widely supported.
  • Cons: May be slower due to the need to create a new array.
• Spread operator (...):
  • Pros: Fast, modern, and widely supported.
  • Cons: Requires JavaScript 5.1 or later (ES6).
• jQuery merge:
  • Pros: Optimized for performance, widely used in web development.
  • Cons: Adds an extra dependency on jQuery.

Library usage

The $.merge() function is part of the jQuery library. It's a utility function that allows concatenating two arrays.

Special JS feature or syntax

None mentioned in this benchmark.

Other alternatives

If you're interested in exploring other approaches, consider:

• Array.prototype.push(): Instead of creating a new array, push elements onto the original array.
• Set: In modern JavaScript, using new Set() and adding elements to it is another way to create an array-like object.