Let's break down the benchmark and explain what's being tested.

Benchmark Definition

The benchmark is comparing two approaches to concatenate arrays in JavaScript: Array.prototype.concat() method and the new ES6 spread operator (...). The script preparation code defines an array params with three elements: "hello", true, and 7.

Options Compared

Two options are being compared:

1. Array.prototype.concat(): This is a traditional method for concatenating arrays, which involves creating a new array object by combining the original array with another array.
2. Spread Operator (...): This is a new syntax introduced in ES6 that allows you to create a new array by spreading elements from an existing array.

Pros and Cons

• Array.prototype.concat():
  • Pros: widely supported, easy to understand for those familiar with JavaScript arrays.
  • Cons: can be slower than the spread operator due to its more complex implementation (creating a new array object).
• Spread Operator (...):
  • Pros: generally faster, more concise and readable, especially in modern browsers that support it well.
  • Cons: less widely supported, may not work as expected in older browsers or environments.

Library

None. This benchmark uses only built-in JavaScript functionality.

Special JS Feature/Syntax

No special features or syntax are used beyond the spread operator.

Other Alternatives

• Array.prototype.push(): Another common way to concatenate arrays in JavaScript, which would involve creating an array and then pushing elements onto it.
• Array.concat() with a function: Creating a function that takes an array as input and returns a new concatenated array.