js-addition/index.js

Addition

function addNumbers(firstNum, secondNum, ...rest) {
  if (!firstNum || !secondNum) {
    throw new Error('Please pass atleast two arguments');
  }

  if (typeof firstNum !== 'number' || typeof secondNum !== 'number') {
    throw new Error('Please pass numbers only');
  }

  const result = rest.reduce((prev, curr) => {
    if (typeof curr !== 'number') {
      throw new Error('Please pass numbers only');
    }
    prev += curr;
    return prev;
  }, firstNum + secondNum);

  console.log(result);
}

export default addNumbers;