How to use an object In Javascript
- Create an object that maps Roman numeral symbols to their decimal values and an empty string to store the Roman numeral representation.
- Iterate through the Roman numeral symbols in descending order of their decimal values. For each symbol, calculate how many times it fits into the input number and append that symbol to the result string that many times.
- Subtract the portion of the number converted to Roman numerals from the input. Repeat this process for all symbols. And then return the result string.
Example: This example shows the implementation of the above-explained approach.
function stringToRoman(num) {
let roman = {
M: 1000, CM: 900, D: 500,
CD: 400, C: 100, XC: 90,
L: 50, XL: 40, X: 10,
IX: 9, V: 5, IV: 4, I: 1
};
let str = '';
for (let i of Object.keys(roman)) {
let q = Math.floor(num / roman[i]);
num -= q * roman[i];
str += i.repeat(q);
}
return str;
}
console.log(stringToRoman(1234));
Output
MCCXXXIV
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