How to use Recursion In Javascript
Using recursion, find the largest Roman numeral less than or equal to the number and append it to the result. Recurse with the remaining value until it reaches zero. Return the concatenated Roman numerals.
Example:
function toRoman(num) {
const romanNumerals = [
{ 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' }
];
if (num === 0) return '';
for (let i = 0; i < romanNumerals.length; i++) {
if (num >= romanNumerals[i].value) {
return romanNumerals[i].numeral + toRoman(num - romanNumerals[i].value);
}
}
}
console.log(toRoman(354)); // Output: "CCCLIV"
Output
CCCLIV
JavaScript Program to Convert a String to Roman Numerals
In this article, we will see how to convert a string to Roman numerals using JavaScript. Converting a string to Roman numerals in JavaScript is a common task when working with text data containing numeric values in Roman numeral format. Roman numerals are a numeral system used in ancient Rome, and they are still used in various contexts such as numbering book chapters, naming monarchs, or denoting particular years.
These are the following methods to convert a string to Roman numerals using JavaScript:
- Using an Array of Values and Symbols
- Using an object