52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
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var parse = require('../parse/index.js')
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/**
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* @category Common Helpers
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* @summary Compare the two dates reverse chronologically and return -1, 0 or 1.
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*
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* @description
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* Compare the two dates and return -1 if the first date is after the second,
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* 1 if the first date is before the second or 0 if dates are equal.
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*
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* @param {Date|String|Number} dateLeft - the first date to compare
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* @param {Date|String|Number} dateRight - the second date to compare
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* @returns {Number} the result of the comparison
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*
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* @example
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* // Compare 11 February 1987 and 10 July 1989 reverse chronologically:
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* var result = compareDesc(
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* new Date(1987, 1, 11),
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* new Date(1989, 6, 10)
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* )
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* //=> 1
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*
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* @example
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* // Sort the array of dates in reverse chronological order:
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* var result = [
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* new Date(1995, 6, 2),
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* new Date(1987, 1, 11),
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* new Date(1989, 6, 10)
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* ].sort(compareDesc)
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* //=> [
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* // Sun Jul 02 1995 00:00:00,
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* // Mon Jul 10 1989 00:00:00,
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* // Wed Feb 11 1987 00:00:00
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* // ]
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*/
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function compareDesc (dirtyDateLeft, dirtyDateRight) {
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var dateLeft = parse(dirtyDateLeft)
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var timeLeft = dateLeft.getTime()
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var dateRight = parse(dirtyDateRight)
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var timeRight = dateRight.getTime()
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if (timeLeft > timeRight) {
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return -1
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} else if (timeLeft < timeRight) {
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return 1
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} else {
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return 0
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}
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}
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module.exports = compareDesc
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