I'll explain what's being tested in the provided benchmark, compare different approaches, and discuss their pros and cons.

What's being tested?

The provided benchmark compares two ways of converting an array to a string:

1. Using the toString() method on the array object: arr.toString()
2. Using template literals (interpolated strings): ${array}

Options comparison

There are two main approaches being compared:

• Approach 1: toString() method: This approach uses the built-in toString() method on the array object to convert it to a string. The toString() method returns a string representation of the object, which can be customized using optional arguments.
• Approach 2: Template literals (interpolated strings): This approach uses template literals, introduced in ECMAScript 2015, to convert the array to a string. Template literals allow you to embed expressions inside string literals, making it easier to format strings.

Pros and Cons

toString() method:

Pros:

• Wide browser support (all browsers support toString() method)
• Simple to implement
• Can be customized using optional arguments

Cons:

• May not produce the desired output if array elements are not strings
• Can be slower than template literals due to the overhead of calling a method on an object

Template literals (interpolated strings):

Pros:

• Produces more predictable and consistent results, as it's designed specifically for string formatting
• Can handle array elements of different data types
• Often faster than toString() method due to its optimized implementation

Cons:

• Requires ECMAScript 2015 or later support
• May have issues with older browsers that don't support template literals

Library usage

There is no library used in this benchmark. Both approaches rely on built-in JavaScript features.

Special JS feature or syntax

Template literals are a special feature of ECMAScript 2015, introduced as a new way of formatting strings. This feature allows you to embed expressions inside string literals using the ${} syntax.

Other alternatives

If you want to compare other ways of converting arrays to strings, here are some alternatives:

• join() method: Using the join() method on an array can also convert it to a string. However, this approach requires specifying a separator and may not be as efficient as template literals.
• Array.prototype.map() + join(): Another approach is to use map() to create a new array with the desired string representation of each element and then join them using the join() method.

These alternatives can provide additional insights into different aspects of array conversion, but they may not be as representative of real-world scenarios as the two approaches being compared in this benchmark.