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import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
* @name compareAsc
* @category Common Helpers
* @summary Compare the two dates 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.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* @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:
* const result = compareAsc(new Date(1987, 1, 11), new Date(1989, 6, 10))
* //=> -1
*
* @example
* // Sort the array of dates:
* const result = [
* new Date(1995, 6, 2),
* new Date(1987, 1, 11),
* new Date(1989, 6, 10)
* ].sort(compareAsc)
* //=> [
* // Wed Feb 11 1987 00:00:00,
* // Mon Jul 10 1989 00:00:00,
* // Sun Jul 02 1995 00:00:00
* // ]
*/
export default function compareAsc(dirtyDateLeft, dirtyDateRight) {
requiredArgs(2, arguments);
var dateLeft = toDate(dirtyDateLeft);
var dateRight = toDate(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;
}
}
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