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JavaScript algorithm for converting Roman numbers to decimal numbers
We are required to write a function that takes in a string of roman number and returns its decimal (base 10) equivalent. Therefore, let’s write the code for this function −
Example
const romanToInt = (s) => {
const legend = "IVXLCDM";
const l=[1,5,10,50,100,500,1000];
let sum=0;
while(s){
if(!!s[1] && legend.indexOf(s[0]) < legend.indexOf(s[1])){
sum += (l[legend.indexOf(s[1])] - l[legend.indexOf(s[0])]);
s = s.substring(2, s.length);
} else {
sum += l[legend.indexOf(s[0])];
s = s.substring(1, s.length);
}
}
return sum;
};
console.log(romanToInt('CLXXVIII'));
console.log(romanToInt('LXXXIX'));
console.log(romanToInt('LV'));
console.log(romanToInt('MDLV'));Output
The output in the console will be −
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Updated on: 21-Aug-2020
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