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51 lines
1.4 KiB
51 lines
1.4 KiB
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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