How can I convert a number to a Roman numeral in JavaScript?
Richard W

Converting a number to a Roman numeral in JavaScript involves implementing a mapping of number values to their corresponding Roman numeral symbols and performing a series of calculations. Here's a step-by-step approach to accomplish this: 1. Define the Mapping: - Create an object that maps the decimal values to their corresponding Roman numeral symbols. - Include all the necessary symbols required for constructing Roman numerals.

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   const romanNumerals = {
     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'
   };

2. Conversion Algorithm: - Implement a function that converts a given number to a Roman numeral. - Iterate through the mapping of decimal values in descending order. - For each decimal value, repeatedly subtract it from the given number until the number is less than the current decimal value. - Append the corresponding Roman numeral symbol to the result string for each subtraction. - Continue this process until the number becomes zero.

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   function convertToRoman(number) {
     let result = '';
     for (let decimal in romanNumerals) {
       while (number >= decimal) {
         result += romanNumerals[decimal];
         number -= decimal;
       }
     }
     return result;
   }

3. Usage: - Call theconvertToRoman() function with the desired number as an argument to obtain its Roman numeral representation.

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   const number = 42;
   const romanNumeral = convertToRoman(number);
   console.log(romanNumeral); // Output: 'XLII'

In this example, the number42 is converted to the Roman numeral'XLII' using theconvertToRoman() function. This approach allows you to convert decimal numbers to Roman numerals by leveraging a mapping of decimal values to their respective symbols. Adjust the mapping according to your specific requirements, ensuring it covers the range of numbers you want to convert.

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