How can I sort an Array of String format of Int Type in Swift [duplicate]

Question

I have an Array of String which this Array of String is in fact an Array of Int, I want sort this Array of String with this code:

let array: [String] = ["13", "8", "10", "12", "3", "7", "1", "2", "11", "9", "6", "4", "5", "1000", "100", "0"].sorted(by: { (value1, value2) in return (value1 < value2) })

but out put is:

["0", "1", "10", "100", "1000", "11", "12", "13", "2", "3", "4", "5", "6", "7", "8", "9"]

I could use (Int(value1) < Int(value2)) for solving issue, but it is not practical in massive array size!

How can I sort my array without having to convert it to Int?

Sahil · Accepted Answer · 2021-07-31 12:51:36Z

1

You can use localizedStandardCompare method to sort like this.

array.sort {$0.localizedStandardCompare($1) == .orderedAscending }
output: ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "100", "1000"]

edited Jul 31, 2021 at 12:51

answered Jul 31, 2021 at 12:46

Sahil

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2 Comments

Cruz Over a year ago

Wow. localizedStandardCompare should be used whenever file names or other strings are presented in lists and tables where Finder-like sorting is appropriate in documents

Leo Dabus Over a year ago

@Cruz stackoverflow.com/a/43870210/2303865

Sulthan · Accepted Answer · 2021-07-31 12:56:28Z

0

You can use the NSString.compare(_:options:) method to compare strings numerically. That will correctly handle leading zeros and similar problems.

let array = ["13", "8", "10", "12", "3", "7", "1", "2", "11", "9", "6", "4", "5", "1000", "100", "0"]
let sortedArray = array.sorted { $0.compare($1, options: .numeric) == .orderedAscending }

print(sortedArray) // ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "100", "1000"]

answered Jul 31, 2021 at 12:56

Sulthan

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3 Comments

Leo Dabus Over a year ago

IMO options numeric is only useful when sorting floating point values otherwise I just use localized standard compare.

Sulthan Over a year ago

@LeoDabus I don't like localizedStandardCompare because the documentation does not really state what the behavior of the method is and it also state that it can change with future releases.

Leo Dabus Over a year ago

I understand but they say it does a finder like sorting and it wouldn’t make any sense to change that behavior

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