How to replace the values of an array with other elements in swift3?

Question

I have an array A which contains 2 arrays :

[[Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday], [Monday, Wednesday]]

Now i want to replace the elements of array A with:

[[Sun, Mon, Tue, Wed, Thu, Fri, Sat], [Mon, Wed]]

For this i am planning to use:

for days in operatingDays {
  for weekdays in days
  {
  if (operatingDays[i] as? String == "Sun") {
    operatingDays[i] = "Su"
  } else if operatingDays[i] as? String == "Mon"{
    operatingDays[i] = "Mo"
  } else if operatingDays[i] as? String == "Tue"{
    operatingDays[i] = "Tu"
  } else if operatingDays[i] as? String == "Wed"{
    operatingDays[i] = "We"
  } else if operatingDays[i] as? String == "Thu"{
    operatingDays[i] = "Th"
  } else if operatingDays[i] as? String == "Fri"{
    operatingDays[i] = "Fr"
  } else if operatingDays[i] as? String == "Sat"{
    operatingDays[i] = "Sa"
  }
}
}

But it is showing the error: But how to implement this in Swift3 any idea will be appreciated.

Show us what did you try so far and what exactly doesn't work. — mag_zbc
– mag_zbc, Commented Jul 20, 2017 at 13:49
Its the same issue from your previous question you need to cast days to [String] — Reinier Melian
– Reinier Melian, Commented Jul 20, 2017 at 13:56
You need to tell the compiler that days is an Array and not a object of type ANy. — Larme
– Larme, Commented Jul 20, 2017 at 13:56
Why the long if-block? Just use substring to get the first three characters of the original string. — return true
– return true, Commented Jul 20, 2017 at 14:01

Daniel Klöck · Accepted Answer · 2017-07-20 14:01:13Z

3

var input = [["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"], ["Monday", "Wednesday"]]

var output = [[String]]()

for array in input {
    output.append(array.map {String($0.characters.prefix(3))})
}

the output will contain [["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"], ["Mon", "Wed"]]

answered Jul 20, 2017 at 14:01

Daniel Klöck

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2 Comments

Chelsea Shawra Over a year ago

It is showing value of Type any has no member "Map"

Daniel Klöck Over a year ago

You must specify that it is an array, for example with as? [String]

vadian · Accepted Answer · 2017-07-20 13:57:40Z

2

Cast operatingDays as something more specific

for days in operatingDays as! [[String]]

answered Jul 20, 2017 at 13:57

vadian

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Comments

Alfredo Luco G · Accepted Answer · 2017-07-20 14:04:35Z

You can use the AnyObject type for casting your array, for example this code could be help you:

var array: [AnyObject] = [[Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday], [Monday, Wednesday]]
array = [[Sun, Mon, Tue, Wed, Thu, Fri, Sat], [Mon, Wed]]

Now if you want to do something special, you must cast that array:

if let item = array[2] as? String{
    print(item)
}

Or you simply print your array:

for item in array{
    print("my item is \(item)")
}

Reinier Melian · Accepted Answer · 2017-07-20 14:21:30Z

Try with this, as I said you need to cast days as [String]

for days in operatingDays {
        if let daysArray = days as? [String]
        {
            for weekdays in daysArray
            {
               operatingDays[i] = 
                if (operatingDays[i] as? String == "Sun") {
                    operatingDays[i] = "Su"
                } else if operatingDays[i] as? String == "Mon"{
                    operatingDays[i] = "Mo"
                } else if operatingDays[i] as? String == "Tue"{
                    operatingDays[i] = "Tu"
                } else if operatingDays[i] as? String == "Wed"{
                    operatingDays[i] = "We"
                } else if operatingDays[i] as? String == "Thu"{
                    operatingDays[i] = "Th"
                } else if operatingDays[i] as? String == "Fri"{
                    operatingDays[i] = "Fr"
                } else if operatingDays[i] as? String == "Sat"{
                    operatingDays[i] = "Sa"
                }
            }
        }
    }

Hope this helps

@ChelseaShawra i am working in improving this code, i think with map can be solved in more shorty way as is showed in the accepted answer

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