CODEWITHSUNDEEP
iosswiftdictionary
tp2376
tp2376

Reputation: 740

Trying to Append multiple values to the same key in a Swift dictionary

I tried to append different values for same key in dict but getting error please help to solve this.. both below dictionary initializations giving errors. 

     //one way of declaring dict 
     public var List = Dictionary<String, Array<Any>>()
     // second way of declaring dict
     public var List = [String: [String]]()

            let bDDR = "b4474rb74g"


            let pressure = 20
            List[bDDR].append(pressure)
            //error is: Cannot subscript a value of type '[String : [String]]' with an index of type '[String]'

            let voltageValue = 3.90

            let tempValue = 97

thanks in advance...

Upvotes: 2

Views: 1848

Answers (3)

Shehata Gamal
Shehata Gamal

Reputation: 100533

You can try this if you wan to overwrite old values

List.updateValue([pressure],forKey:bDDR)

if you want to append

List.updateValue(List[bDDR]! + [pressure],forKey:bDDR)

Upvotes: 0

ukim
ukim

Reputation: 2477

You cannot append it in place. Because List[BDDR] gives you a constant copy of the array. You have to assign the list array to a variable, append the value and then set ti back to the dict.

var list = List[BDDR]
list?.append(pressure)
List[bDDR] = list

Also, public var List = [String: [String]](), will not work, because you are appending an Int instead of a String. public var List = Dictionary<String, Array<Any>>() will work because Int is also Any.

Upvotes: 1

Hendra Kusumah
Hendra Kusumah

Reputation: 186

List.updateValue([pressure.description], forKey: bDDR)

Upvotes: 0

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