Function matchingDigits

test/big-decimal/precision-comparison.test.ts:34–42

* Count matching significant digits between two numeric strings. * Returns the number of leading digits that agree.

(a: string, b: string)

 * Returns the number of leading digits that agree.
 */
function matchingDigits(a: string, b: string): number {
  const da = sigDigits(a);
  const db = sigDigits(b);
  const len = Math.min(da.length, db.length);
  for (let i = 0; i < len; i++) {
    if (da[i] !== db[i]) return i;
  }
  return len;
}

/**
 * Compute factorial as a BigDecimal string.