Question 1

How do I round numbers using banker's rounding in JavaScript?

Accepted Answer

Use round-to with the 'toNearestOrEven' option, like roundTo(4.5, 0, {roundingRule: 'toNearestOrEven'}) which returns 4. This is essential for financial applications to reduce rounding bias compared to traditional methods.

Question 2

round-to vs toFixed: which should I use?

Accepted Answer

round-to returns a number with flexible rounding rules, ideal for calculations, while toFixed returns a string with limited rounding. Use round-to for precision control, like banker's rounding, and toFixed only for simple display formatting.

Question 3

How to install and use round-to in a Node.js project?

Accepted Answer

Install via npm install round-to, then import functions like roundTo. The README provides clear examples, such as roundTo(1.234, 2) to round to two decimal places, making setup straightforward.

Question 4

Does round-to work with negative numbers and precision?

Accepted Answer

Yes, it supports negative precision to round to the left of the decimal, e.g., roundTo(1234.56, -2) gives 1200, and handles negative numbers correctly with various rounding rules, as shown in the documentation.

Question 5

What are the performance implications of using round-to?

Accepted Answer

round-to adds a small overhead compared to native methods like Math.round, but for most applications, it's negligible. If performance is critical, benchmark it in your context, as library calls can slow down tight loops.

Question 6

How to handle rounding for very large or small numbers with round-to?

Accepted Answer

round-to uses standard JavaScript number precision, so it has the same limitations for extreme values. For arbitrary precision, consider libraries like decimal.js, as round-to focuses on rounding within JavaScript's floating-point limits.

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