Javascript Example - Objects and Functions - Clock

// function to convert a decimal number to its roman representation
function toRomanNumber(decimalNumber) {
  if (decimalNumber == 0) {
    return "";
  }
 
  const romanMap = [
    { value: 1000, numeral: "M" },
    { value: 900, numeral: "CM" },
    { value: 500, numeral: "D" },
    { value: 400, numeral: "CD" },
    { value: 100, numeral: "C" },
    { value: 90, numeral: "XC" },
    { value: 50, numeral: "L" },
    { value: 40, numeral: "XL" },
    { value: 10, numeral: "X" },
    { value: 9, numeral: "IX" },
    { value: 5, numeral: "V" },
    { value: 4, numeral: "IV" },
    { value: 1, numeral: "I" },
  ];
 
  let result = "";
  let remaining = decimalNumber;
 
  for (const r of romanMap) {
    while (remaining >= r.value) {
      result += r.numeral;
      remaining -= r.value;
    }
  }
 
  return result;
}
 
// object that stores hours, minutes and seconds
// can advance clock for one second using tick()
// has different display options (normal, binary, roman)
let clock = {
  hours: 0,
  minutes: 0,
  seconds: 0,
  display: function () {
    console.log(`${this.hours}:${this.minutes}:${this.seconds}`);
  },
  romanDisplay: function () {
    console.log(
      `${toRomanNumber(this.hours)}:${toRomanNumber(
        this.minutes
      )}:${toRomanNumber(this.seconds)}`
    );
  },
  binaryDisplay: function () {
    console.log(
      `${this.hours.toString(2)}:${this.minutes.toString(
        2
      )}:${this.seconds.toString(2)}`
    );
  },
  tick: function () {
    this.seconds++;
    if (this.seconds == 60) {
      this.minutes++;
      this.seconds = 0;
    }
    if (this.minutes == 60) {
      this.hours++;
      this.minutes = 0;
    }
    if (this.hours == 24) {
      this.hours = 0;
    }
  },
};
 
// start of the program
///////////////////////
 
// get current system time
let now = new Date();
 
// initialize clock object
clock.hours = now.getHours();
clock.minutes = now.getMinutes();
clock.seconds = now.getSeconds();
 
// update clock each second
setInterval(() => {
  console.clear();
  clock.tick();
  clock.display();
  clock.binaryDisplay();
  clock.romanDisplay();
}, 1000);