How can I convert a number to Roman numerals in JavaScript?
Rashid D

Converting a number to Roman numerals in JavaScript involves creating a mapping between decimal numbers and their corresponding Roman numeral symbols. Here's a step-by-step approach to achieving this: 1. Create a mapping for Roman numeral symbols: - Create an object that maps decimal numbers to their corresponding Roman numeral symbols. This mapping will be used to convert each digit of the given number into Roman numerals.

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   const romanSymbols = {
     1000: 'M',
     900: 'CM',
     500: 'D',
     400: 'CD',
     100: 'C',
     90: 'XC',
     50: 'L',
     40: 'XL',
     10: 'X',
     9: 'IX',
     5: 'V',
     4: 'IV',
     1: 'I',
   };

In this example, the mapping includes symbols for numbers up to 1000, covering the most commonly used Roman numerals. 2. Write a function to convert the number to Roman numerals: - Create a function that takes a decimal number as input and converts it to Roman numerals using the mapping defined above.

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   function convertToRoman(number) {
     let result = '';

     for (const value in romanSymbols) {
       while (number >= value) {
         result += romanSymbols[value];
         number -= value;
       }
     }

     return result;
   }

In this function, a loop iterates over each value in the mapping object. For each value, it checks if the input number is greater than or equal to the current value. If it is, the corresponding Roman numeral symbol is appended to the result string, and the number is reduced by the current value. The loop continues until the number becomes zero. 3. Call the function to convert a number: - Use theconvertToRoman() function to convert a decimal number to Roman numerals.

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   const number = 123;
   const romanNumeral = convertToRoman(number);
   console.log(romanNumeral); // Output: "CXXIII"

In this example, the number123 is converted to Roman numerals using theconvertToRoman() function, resulting in the string"CXXIII". By following this approach, you can convert decimal numbers to Roman numerals in JavaScript. Note that this implementation assumes the input number is within the range of numbers covered by the mapping object. Adjust the mapping or add additional symbols if you need to convert larger numbers. Keep in mind that this conversion follows the standard Roman numeral rules, including subtractive notation. If you need to handle non-standard or specialized Roman numeral conversions, you may need to modify the mapping and conversion logic accordingly.

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