// Calculator module with basic arithmetic operations

/**
 * Adds two numbers
 * @param {number} a - First number
 * @param {number} b - Second number
 * @returns {number} Sum of a and b
 */
function add(a, b) {
  return a + b;
}

/**
 * Subtracts second number from first
 * @param {number} a - First number
 * @param {number} b - Second number
 * @returns {number} Difference of a and b
 */
function subtract(a, b) {
  return a - b;
}

/**
 * Multiplies two numbers
 * @param {number} a - First number
 * @param {number} b - Second number
 * @returns {number} Product of a and b
 */
function multiply(a, b) {
  return a * b;
}

/**
 * Divides first number by second
 * @param {number} a - Dividend
 * @param {number} b - Divisor
 * @returns {number} Quotient of a and b
 */
function divide(a, b) {
  if (b === 0) {
    throw new Error('Cannot divide by zero');
  }
  return a / b;
}

// Export all functions
module.exports = {
  add,
  subtract,
  multiply,
  divide
};