/
13_RomanToInteger.js
99 lines (90 loc) · 2.07 KB
/
13_RomanToInteger.js
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const assert = require('assert');
/**
* Given a roman numeral, convert it to an integer.
*
* @param {string} s
* @return {number}
*/
var romanToInt = function(s) {
if (s == undefined || s.length == 0)
{
return 0;
}
let results = 0;
let next_char = undefined;
let next_two_chars = undefined;
// For each letter translate to numbers, and add to the
// overall sum:
for (let i = 0; i < s.length; i++)
{
next_char = s[i];
switch (next_char)
{
case 'I':
{
if ((s[i+1] == 'V') || (s[i+1] == 'X'))
{
results -= 1;
}
else
{
results += 1;
}
break;
}
case 'V':
{
results = results + 5;
break;
}
case 'X':
{
if ((s[i+1] == 'L') || (s[i+1] == 'C'))
{
results -= 10;
}
else
{
results += 10;
}
break;
}
case 'L':
{
results = results + 50;
break;
}
case 'C':
{
if ((s[i+1] == 'D') || (s[i+1] == 'M'))
{
results -= 100;
}
else
{
results += 100;
}
break;
}
case 'D':
{
results = results + 500;
break;
}
case 'M':
{
results = results + 1000;
break;
}
}
}
return results;
};
describe('13_RomanToInteger.js', function ()
{
it('should return 1989', function ()
{
let results = romanToInt(("MCMLXXXIX"));
assert.deepEqual(1989, results);
});
});