Let's break down the benchmark and its options.

Benchmark Purpose The benchmark compares the performance of two approaches for creating a shallow copy of an array: the Array.prototype.slice() method and the new ES6 spread operator ([ ...params ]).

Options Compared

1. Array.prototype.slice(): This method creates a new array by extracting a range of elements from another array.
2. Spread Operator ([ ...params ]): This operator creates a new array by taking all elements from the params array.

Pros and Cons of Each Approach

• Array.prototype.slice():
  • Pros:
    • Widely supported and well-known method.
    • Generally faster due to its native implementation.
  • Cons:
    • Requires an extra function call (.slice()).
    • May have performance overhead depending on the browser.
• Spread Operator ([ ...params ]):
  • Pros:
    • Newer and more modern approach, which might be more efficient in some cases.
    • Simplifies code and reduces clutter by eliminating the need for a separate function call.
  • Cons:
    • Less widely supported (only introduced in ES6).
    • Might have performance overhead depending on the browser.

Library/Function Used None, as this benchmark only compares two native JavaScript methods.

Special JS Feature/Syntax The spread operator ([ ...params ]) is a new feature introduced in ECMAScript 2015 (ES6). It's designed to simplify array creation and copying by allowing you to take elements from an existing array using the ... syntax.

Other Alternatives

In addition to these two methods, there are other ways to create a shallow copy of an array, such as:

• Using the Array.prototype.slice() method with no arguments (which creates an empty array).
• Using a library like Lodash (_.cloneDeep()) or a dedicated array cloning function.

However, for simple cases where you only need to create a shallow copy of an array, the spread operator and Array.prototype.slice() methods are likely sufficient.