I'd be happy to help explain the benchmark being tested on MeasureThat.net.

Benchmark Overview

The benchmark tests two different approaches for converting a floating-point number to an integer: using parseFloat followed by toFixed, and using Math.round. The input value is set to '0.123456789'.

Options Compared

Two options are compared:

1. parseFloat(parseFloat(someFloat).toFixed(2);: This approach uses the parseFloat function twice, first to convert the string to a floating-point number, and then again to extract two decimal places using toFixed. The resulting integer value is then returned.
2. Math.round(someFloat * 100) / 100;: This approach multiplies the input float by 100, rounds the result using Math.round, and then divides by 100 to get the original integer value.

Pros and Cons

parseFloat(parseFloat(someFloat).toFixed(2);

Pros:

• More precise control over the number of decimal places
• May be more suitable for certain use cases where a specific precision is required

Cons:

• Requires two function calls, which may lead to increased overhead
• The first parseFloat call may not be necessary if the input string already represents a float

Math.round(someFloat * 100) / 100;

Pros:

• Single function call with minimal overhead
• Avoids unnecessary conversions

Cons:

• May lose precision due to the multiplication and division by 100
• Does not provide direct control over decimal places

Library: None

Neither option uses any external libraries. Both are built-in JavaScript functions.

Special JS Feature or Syntax: None

There is no special JavaScript feature or syntax being tested in this benchmark.

Other Alternatives

If you were to implement these tests yourself, some alternative approaches might include:

• Using Number instead of parseFloat (since Number can parse strings that represent floats)
• Implementing a custom rounding algorithm
• Testing other rounding modes, such as half-even or banker's rounding

However, for most use cases, the built-in JavaScript functions used in this benchmark will provide adequate results.