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- "use strict";
- var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
- Object.defineProperty(exports, "__esModule", {
- value: true
- });
- exports.default = compareDesc;
- var _index = _interopRequireDefault(require("../toDate/index.js"));
- var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
- /**
- * @name compareDesc
- * @category Common Helpers
- * @summary Compare the two dates reverse chronologically and return -1, 0 or 1.
- *
- * @description
- * Compare the two dates and return -1 if the first date is after the second,
- * 1 if the first date is before the second or 0 if dates are equal.
- *
- * @param {Date|Number} dateLeft - the first date to compare
- * @param {Date|Number} dateRight - the second date to compare
- * @returns {Number} the result of the comparison
- * @throws {TypeError} 2 arguments required
- *
- * @example
- * // Compare 11 February 1987 and 10 July 1989 reverse chronologically:
- * const result = compareDesc(new Date(1987, 1, 11), new Date(1989, 6, 10))
- * //=> 1
- *
- * @example
- * // Sort the array of dates in reverse chronological order:
- * const result = [
- * new Date(1995, 6, 2),
- * new Date(1987, 1, 11),
- * new Date(1989, 6, 10)
- * ].sort(compareDesc)
- * //=> [
- * // Sun Jul 02 1995 00:00:00,
- * // Mon Jul 10 1989 00:00:00,
- * // Wed Feb 11 1987 00:00:00
- * // ]
- */
- function compareDesc(dirtyDateLeft, dirtyDateRight) {
- (0, _index2.default)(2, arguments);
- var dateLeft = (0, _index.default)(dirtyDateLeft);
- var dateRight = (0, _index.default)(dirtyDateRight);
- var diff = dateLeft.getTime() - dateRight.getTime();
- if (diff > 0) {
- return -1;
- } else if (diff < 0) {
- return 1;
- // Return 0 if diff is 0; return NaN if diff is NaN
- } else {
- return diff;
- }
- }
- module.exports = exports.default;
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