function fromDecimalToHex(number) {
  if (typeof number !== 'number') throw 'The input provided should be a number';
  return "0x" + number.toString(16);
}

function fromHexToDecimal(hex) {
  if (typeof hex !== 'string') throw 'The input provided should be a string';
  return parseInt(hex, 16);
}

module.exports = {
  fromDecimalToHex: fromDecimalToHex,
  fromHexToDecimal: fromHexToDecimal
};