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index.ts
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index.ts
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import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name min
* @category Common Helpers
* @summary Returns the earliest of the given dates.
*
* @description
* Returns the earliest of the given dates.
*
* ### 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).
*
* - `min` function now accepts an array of dates rather than spread arguments.
*
* ```javascript
* // Before v2.0.0
* const date1 = new Date(1989, 6, 10)
* const date2 = new Date(1987, 1, 11)
* const minDate = min(date1, date2)
*
* // v2.0.0 onward:
* const dates = [new Date(1989, 6, 10), new Date(1987, 1, 11)]
* const minDate = min(dates)
* ```
*
* @param {Date[]|Number[]} datesArray - the dates to compare
* @returns {Date} - the earliest of the dates
* @throws {TypeError} 1 argument required
*
* @example
* // Which of these dates is the earliest?
* const result = min([
* new Date(1989, 6, 10),
* new Date(1987, 1, 11),
* new Date(1995, 6, 2),
* new Date(1990, 0, 1)
* ])
* //=> Wed Feb 11 1987 00:00:00
*/
export default function min(dirtyDatesArray: Array<Date | number>): Date {
requiredArgs(1, arguments)
let datesArray: Date[] | number[]
// `dirtyDatesArray` is Array, Set or Map, or object with custom `forEach` method
if (dirtyDatesArray && typeof dirtyDatesArray.forEach === 'function') {
datesArray = dirtyDatesArray
// If `dirtyDatesArray` is Array-like Object, convert to Array.
} else if (typeof dirtyDatesArray === 'object' && dirtyDatesArray !== null) {
datesArray = Array.prototype.slice.call(dirtyDatesArray)
} else {
// `dirtyDatesArray` is non-iterable, return Invalid Date
return new Date(NaN)
}
let result: Date | undefined
datesArray.forEach(function (dirtyDate: Date | number) {
let currentDate = toDate(dirtyDate)
if (
result === undefined ||
result > currentDate ||
isNaN(currentDate.getDate())
) {
result = currentDate
}
})
return result || new Date(NaN)
}