How to append optional string without adding optional?

Question

here is what i do to parse int value:

anyObj = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! Dictionary<String,AnyObject>

let categoryId = String(anyObj["id"])


let link = "categoryId" + categoryId

print(link) 

where categoryId is integer value

here is what i got :

/category/Optional(127)

How to remove the word optional ?

NOTE: i have looked at this question. also i have tried this also let link = "categoryId" + categoryId! but without luck

thanks

Answer 1

A value for a key of a dictionary is always optional because the key might not exist.

You need to unwrap the optional

let categoryId = String(anyObj["id"]!)

A safer solution is optional binding

if let categoryId = anyObj["id"] {
   let link = "categoryId" + String(categoryId)
}

Answer 2

var link = "categoryId";
if let categoryId = String(anyObj["id"]) {
    link += categoryId
}