2021-05-21 11:16:11 +05:30
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const values = {
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2020-06-21 10:39:32 +05:30
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I: 1,
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V: 5,
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X: 10,
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L: 50,
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C: 100,
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D: 500,
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M: 1000
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}
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2019-10-01 08:04:18 -05:00
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2021-10-11 16:33:44 +02:00
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export function romanToDecimal (romanNumber) {
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2020-06-21 10:39:32 +05:30
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let prev = ' '
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2019-10-01 08:04:18 -05:00
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2020-06-21 10:39:32 +05:30
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let sum = 0
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2019-10-01 08:04:18 -05:00
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2020-06-21 10:39:32 +05:30
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let newPrev = 0
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for (let i = romanNumber.length - 1; i >= 0; i--) {
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const c = romanNumber.charAt(i)
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2019-10-01 08:04:18 -05:00
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2020-06-21 10:39:32 +05:30
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if (prev !== ' ') {
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newPrev = values[prev] > newPrev ? values[prev] : newPrev
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2019-10-01 08:04:18 -05:00
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}
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2020-06-21 10:39:32 +05:30
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const currentNum = values[c]
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if (currentNum >= newPrev) {
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sum += currentNum
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2019-10-01 08:04:18 -05:00
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} else {
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2020-06-21 10:39:32 +05:30
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sum -= currentNum
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2019-10-01 08:04:18 -05:00
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}
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2020-06-21 10:39:32 +05:30
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prev = c
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2019-10-01 08:04:18 -05:00
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}
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2020-06-21 10:39:32 +05:30
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return sum
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2019-10-01 08:04:18 -05:00
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}
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