Function snapValueToStep

packages/react-stately/src/utils/number.ts:43–73

(
  value: number,
  min: number | undefined,
  max: number | undefined,
  step: number
)

}

export function snapValueToStep(
  value: number,
  min: number | undefined,
  max: number | undefined,
  step: number
): number {
  min = Number(min);
  max = Number(max);
  let remainder = (value - (isNaN(min) ? 0 : min)) % step;
  let snappedValue = roundToStepPrecision(
    Math.abs(remainder) * 2 >= step
      ? value + Math.sign(remainder) * (step - Math.abs(remainder))
      : value - remainder,
    step
  );

  if (!isNaN(min)) {
    if (snappedValue < min) {
      snappedValue = min;
    } else if (!isNaN(max) && snappedValue > max) {
      snappedValue = min + Math.floor(roundToStepPrecision((max - min) / step, step)) * step;
    }
  } else if (!isNaN(max) && snappedValue > max) {
    snappedValue = Math.floor(roundToStepPrecision(max / step, step)) * step;
  }

  // correct floating point behavior by rounding to step precision
  snappedValue = roundToStepPrecision(snappedValue, step);

  return snappedValue;
}

/* Takes a value and rounds off to the number of digits. */
export function toFixedNumber(value: number, digits: number, base: number = 10): number {