Is it possible to convert a number into Roman numerals using this method?

Question

Is it possible to convert a number into Roman numerals using this method?

I am experimenting with creating my own method for Romanising numbers and I'm seeking some advice on its feasibility.

Currently, my code returns Null with each iteration. I can't figure out what's causing this issue. Any suggestions would be greatly appreciated!

var array;
var result = [];

function convertToRoman(num) {
  array = num.toString().split('').reverse();

  roman = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX",
    "", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC",
    "", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"
  ];

  for (i = 0, j = 0; i < array.length; i++, j += 10) {
    var location = array[i] + j;
    result = result.concat(roman[location]);
  }

  return result.reverse().join();
}

console.log(convertToRoman(123));

javascript arrays for-loop

Answer 1

Answer №1

When dealing with an array that contains strings, it's important to remember to convert them back into integers for arithmetic operations. Here's one way you could approach this:

var roman = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX",
  "", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC",
  "", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"
];

function convertToRoman(num) {
  var result = [];
  var array = num.toString().split('').reverse();

  for (i = 0, j = 0; i < array.length; i++, j += 10) {
    var location = parseInt(array[i]) + j;
    result.push(roman[location]);
  }

  return result.reverse().join('');
}

console.log(convertToRoman(123));

It's worth noting that some changes were made in terms of variable scope and the use of array.push(). The code wasn't tested with multiple inputs, however, the primary focus was on getting the algorithm correct rather than optimizing it for all scenarios.

Answer 2

When dealing with an array that contains strings, it's important to remember to convert them back into integers for arithmetic operations. Here's one way you could approach this:

var roman = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX",
  "", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC",
  "", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"
];

function convertToRoman(num) {
  var result = [];
  var array = num.toString().split('').reverse();

  for (i = 0, j = 0; i < array.length; i++, j += 10) {
    var location = parseInt(array[i]) + j;
    result.push(roman[location]);
  }

  return result.reverse().join('');
}

console.log(convertToRoman(123));

It's worth noting that some changes were made in terms of variable scope and the use of array.push(). The code wasn't tested with multiple inputs, however, the primary focus was on getting the algorithm correct rather than optimizing it for all scenarios.

Is it possible to convert a number into Roman numerals using this method?

Answer №1

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