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round ​

Problem ​

You need to round a number to a specific decimal precision — avoiding the floating-point inaccuracies of naive Math.round.

Solution ​

Use round(value, precision?, parser?) to round to precision decimal places.

ts
import { round } from '@vielzeug/arsenal';

round(3.14159, 2); // 3.14
round(3.14159, 0); // 3
round(1.005, 2); // 1.01

Pitfalls ​

  • Default precision is 0 (rounds to nearest integer).
  • Floating-point representation means some values behave unexpectedly — round uses the standard multiply-round-divide approach which handles most common cases correctly.