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Merged
raklaptudirm merged 3 commits into from
Oct 2, 2021
Merged

Added DecimalToRoman #707

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49d0630
Added DecimalToRoman
Oct 1, 2021
167bc10
add explanation
Oct 1, 2021
26b5b7c
added test
Oct 2, 2021
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52 changes: 52 additions & 0 deletions Conversions/DecimalToRoman.js
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Original file line number Diff line number Diff line change
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/*
Decimal To Roman

This algorithm take decimal number and convert to roman numeral according to standard form (https://en.wikipedia.org/wiki/Roman_numerals#Description)

Algorithm & Explanation : https://www.rapidtables.com/convert/number/how-number-to-roman-numerals.html
*/

const values = {
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
}

const orders = [
'M',
'CM',
'D',
'CD',
'C',
'XC',
'L',
'XL',
'X',
'IX',
'V',
'IV',
'I'
]

function decimalToRoman (num) {
let roman = ''
for (var symbol of orders) {
while (num >= values[symbol]) {
roman += symbol
num -= values[symbol]
}
}
return roman
}

export { decimalToRoman }
13 changes: 13 additions & 0 deletions Conversions/test/DecimalToRoman.test.js
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import { decimalToRoman } from '../DecimalToRoman'

describe('decimalToRoman', () => {
it('expects to return correct roman numeral of given number', () => {
expect(decimalToRoman(34)).toBe('XXXIV')
})
it('expects to return correct roman numeral of given number', () => {
expect(decimalToRoman(28)).toBe('XXVIII')
})
it('expects to return correct roman numeral of given number', () => {
expect(decimalToRoman(2021)).toBe('MMXXI')
})
})