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solution #2677

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496f9da
solution
bethrei Jun 23, 2026
e4b2ec7
fix: previously code altered original arays
bethrei Jun 23, 2026
85ebbbc
get rid of constant one-element arrays
bethrei Jun 23, 2026
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27 changes: 26 additions & 1 deletion src/formatDate.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,32 @@
* @returns {string}
*/
function formatDate(date, fromFormat, toFormat) {
// write code here
const newOrder = toFormat.slice(0, -1);
const newSeparator = toFormat[toFormat.length - 1];
const oldOrder = fromFormat.slice(0, -1);
const oldSeparator = fromFormat[fromFormat.length - 1];
const formatToDate = {};
let dateParts = date.split(oldSeparator);

for (let i = 0; i < dateParts.length; i++) {
formatToDate[oldOrder[i]] = dateParts[i];
}

dateParts = [];

for (const part of newOrder) {
if (part in formatToDate) {
dateParts.push(formatToDate[part]);
} else if (part === 'YYYY') {
const centuryDigits = formatToDate.YY < 30 ? '20' : '19';

dateParts.push(centuryDigits + formatToDate.YY);
} else if (part === 'YY') {
dateParts.push(formatToDate.YYYY.slice(-2));
}
}

return dateParts.join(newSeparator);
}

module.exports = formatDate;
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