2-calcul_chai.js

// function that accepts 3 arguments and add, subtract or divide numbers
const calculateNumber = (type, a, b) => {
  switch (type) {
    case 'SUM':
      return Math.round(a) + Math.round(b);
    case 'SUBTRACT':
      return Math.round(a) - Math.round(b);
    case 'DIVIDE':
      if (Math.round(b) === 0) return 'Error';
      return Math.round(a) / Math.round(b);
    default:
      throw new Error('Invalid type. Type must be SUM, SUBTRACT, or DIVIDE.');
  }
};
module.exports = calculateNumber;