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import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name max
* @category Common Helpers
* @summary Return the latest of the given dates.
*
* @description
* Return the latest 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).
*
* - `max` function now accepts an array of dates rather than spread arguments.
*
* ```javascript
* // Before v2.0.0
* var date1 = new Date(1989, 6, 10)
* var date2 = new Date(1987, 1, 11)
* var maxDate = max(date1, date2)
*
* // v2.0.0 onward:
* var dates = [new Date(1989, 6, 10), new Date(1987, 1, 11)]
* var maxDate = max(dates)
* ```
*
* @param {Date[]|Number[]} datesArray - the dates to compare
* @returns {Date} the latest of the dates
* @throws {TypeError} 1 argument required
*
* @example
* // Which of these dates is the latest?
* var result = max([
* new Date(1989, 6, 10),
* new Date(1987, 1, 11),
* new Date(1995, 6, 2),
* new Date(1990, 0, 1)
* ])
* //=> Sun Jul 02 1995 00:00:00
*/
export default function max(dirtyDatesArray: Date[] | string[] | number[]): Date {
requiredArgs(1, arguments)
let datesArray
// `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) {
const currentDate = toDate(dirtyDate)
if (result === undefined || result < currentDate || isNaN(Number(currentDate))) {
result = currentDate
}
})
return result || new Date(NaN)
}
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