Question: 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...

Answer: 
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.
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)

```