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- import toDate from "../toDate/index.js";
- import requiredArgs from "../_lib/requiredArgs/index.js";
- /**
- * @name getDecade
- * @category Decade Helpers
- * @summary Get the decade of the given date.
- *
- * @description
- * Get the decade of the given date.
- *
- * @param {Date|Number} date - the given date
- * @returns {Number} the year of decade
- * @throws {TypeError} 1 argument required
- *
- * @example
- * // Which decade belongs 27 November 1942?
- * const result = getDecade(new Date(1942, 10, 27))
- * //=> 1940
- */
- export default function getDecade(dirtyDate) {
- requiredArgs(1, arguments);
- var date = toDate(dirtyDate);
- var year = date.getFullYear();
- var decade = Math.floor(year / 10) * 10;
- return decade;
- }
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