50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
(function () {
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'use strict';
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// If the Roman is a string, pass any delimiters through
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// (Int | String) -> String
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function romanTranscription(a) {
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if (typeof a === 'string') {
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var ps = a.split(/\d+/),
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dlm = ps.length > 1 ? ps[1] : undefined;
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return (dlm ? a.split(dlm)
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.map(function (x) {
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return Number(x);
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}) : [a])
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.map(roman)
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.join(dlm);
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} else return roman(a);
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}
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// roman :: Int -> String
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function roman(n) {
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return [[1000, "M"], [900, "CM"], [500, "D"], [400, "CD"], [100,
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"C"], [90, "XC"], [50, "L"], [40, "XL"], [10, "X"], [9,
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"IX"], [5, "V"], [4, "IV"], [1, "I"]]
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.reduce(function (a, lstPair) {
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var m = a.remainder,
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v = lstPair[0];
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return (v > m ? a : {
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remainder: m % v,
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roman: a.roman + Array(
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Math.floor(m / v) + 1
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)
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.join(lstPair[1])
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});
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}, {
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remainder: n,
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roman: ''
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}).roman;
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}
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// TEST
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return [2016, 1990, 2008, "14.09.2015", 2000, 1666].map(
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romanTranscription);
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})();
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