Let's break down the benchmark and its test cases.

What is tested?

The benchmark tests two ways to round a floating-point number: toFixed() and Math.round(). The goal is to determine which method is faster for rounding numbers with 2 decimal places.

Options compared:

There are two options being compared:

1. toFixed(2): This method converts the floating-point number to a string, padding it with zeros if necessary, and then converts the resulting string back to a float. The second argument 2 specifies the minimum number of digits to be included in the formatted string.
2. Math.round(*100)/100: This method first multiplies the floating-point number by 100 to shift its decimal point two places to the right, then rounds it using Math.round(), and finally divides the result by 100 to restore the original decimal point.

Pros and cons of each approach:

1. toFixed(2):
   • Pros:
     • More readable code (less magic numbers)
     • May be more intuitive for developers familiar with string formatting
   • Cons:
     • Requires creating a string, which can be slower than arithmetic operations
     • May not work well with very large or very small numbers due to precision issues
2. Math.round(*100)/100:
   • Pros:
     • Faster, as it only involves arithmetic operations
     • More robust, as it doesn't require creating a string
   • Cons:
     • Less readable code (more magic numbers)
     • May not be immediately obvious what's happening in the calculation

Library and special JS feature:

There are no libraries used in this benchmark. However, the Math.round() function is a built-in JavaScript method.

Special JS feature:

There is no specific JavaScript feature being tested or leveraged in this benchmark.

Other alternatives:

If you want to explore alternative methods for rounding numbers, some options include:

1. Number.toFixed(2): This is similar to toFixed(2), but uses a different syntax.
2. BigInt: For very large or very small numbers, using BigInt and toString() with a specific radix (e.g., 16 for hexadecimal) might be faster or more efficient.
3. Third-party libraries: There are many third-party libraries available that provide optimized rounding functions, such as lodash.round(), but these would likely incur performance overhead.

Keep in mind that the choice of rounding method depends on the specific use case and requirements of your project.