CODEWITHSUNDEEP
swiftstringdatensmutablearray
user2786
user2786

Reputation: 716

How to Sort a string date array

I want to sort an array in ascending order. The dates are in string format

Optional(["2019-07-08", "2019-07-09", "2019-07-10", "2019-07-11", "2019-07-12", "2019-07-02"])

I am trying using below code but it's not working.

aryEventTime = aryEventTime.sorted(by: { ($0 as AnyObject).date.compare($1.date) == ComparisonResult.orderedAscending })


aryEventTime = aryEventTime.sorted(by: {
            ($0 as AnyObject).date.compare(($1 as AnyObject).date) == .orderedDescending}) as? NSMutableArray

Upvotes: 2

Views: 1178

Answers (3)

PGDev
PGDev

Reputation: 24341

The array of String that you have is,

let arr = ["2019-07-08", "2019-07-09", "2019-07-10", "2019-07-11", "2019-07-12", "2019-07-02"]

Instead of converting the String to Date, you can simply sort this array using sorted(), i.e.

let sortedArr = arr.sorted()
print(sortedArr)

Output:

["2019-07-02", "2019-07-08", "2019-07-09", "2019-07-10", "2019-07-11", "2019-07-12"]

Note: date strings can only be sorted without conversion in special cases such as this one. If the strings were in the format yyyy-dd-MM, for example, then simple string sorting would not work.

Upvotes: 0

dalton_c
dalton_c

Reputation: 7171

I would not advise making it a practice doing lexicographic sorting on dates. It's simple enough just to parse these strings to proper Date objects and sort on those:

let dateStrings = Optional(["2019-07-08", "2019-07-09", "2019-07-10", "2019-07-11", "2019-07-12", "2019-07-02"])

let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
let sortedDates = dateStrings?.compactMap(formatter.date(from:)).sorted()

Upvotes: 3

user2786
user2786

Reputation: 716

I got the answer:

let sortedArray = aryEventTime.sorted { $0.localizedCaseInsensitiveCompare($1) == ComparisonResult.orderedAscending }

Upvotes: 1

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