How to add associative array elements in Swift
How do I create and add to an associative array in Swift? I would think it should be something like the following (note that some values are strings and others are numbers):
var myArray = []
var make = "chevy"
var year = 2008
var color = "red"
myArray.append("trackMake":make,"trackYear":year,"trackColor":color)
The goal is to have an array full of results where I can make a call like:
println(myArray[0]["trackMake"]) //and get chevy
println(myArray[0]["trackColor"]) //and get red
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Just:
myArray.append(["trackMake":make,"trackYear":year,"trackColor":color])
Add brackets. This will make a hash and add it to the array.
In such cases, make (extensive) use let
:
let dict = ["trackMake":make,"trackYear":year,"trackColor":color]
myArray.append(dict)
The above assumes yours myArray
was declared as
var myArray = [[String:AnyObject]]()
so the compiler knows that it will accept dictionary elements.
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I accept the answer above. It's good. Even if you gave the correct answer, I like the simplest way. The following steps are helpful if you guys are following this. Also if someone is new to the fast and if they get through it, they can easily understand the steps.
STEP 1: declare and initialize variables
var array = Array<AnyObject>()
var dict = Dictionary<String, AnyObject>()
var make = "chevy"
var year = 2008
var color = "red"
STEP 2: Install the dictionary (add keys and values)
dict["trackMake"] = make
dict["trackYear"] = year
dict["trackColor"] = color
println("the dict is-\(dict)")
STEP 3: add dictionary to array
array.append(dict)
println("the array is-\(array)")
STEP 4: Get the values of the variable array (create a variable to get the value)
let getMakeValue = array[0]["trackMake"]
let getYearValue = array[0]["trackYear"]
let getColorValue = array[0]["trackColor"]
println("the getMakeValue is - \(getMakeValue)")
println("the getYearValue is - \(getYearValue)")
println("the getColorVlaue is - \(getColorValue)")
STEP 5: If you want to get the values in the string, follow these steps
var stringMakeValue:String = getMakeValue as String
var stringYearValue:String = ("\(getYearValue as Int)")
var stringColorValue:String = getColorValue as String
println("the stringMakeValue is - \(stringMakeValue)")
println("the stringYearValue is - \(stringYearValue)")
println("the stringColorValue is - \(stringColorValue)")
STEP 6: Finally, general output values
the dict is-[trackMake: chevy, trackColor: red, trackYear: 2008]
the array is-[{
trackColor = red;
trackMake = chevy;
trackYear = 2008;
}]
the getMakeValue is - Optional(chevy)
the getYearValue is - Optional(2008)
the getColorVlaue is - Optional(red)
the stringMakeValue is - chevy
the stringYearValue is - 2008
the stringColorValue is - red
thank
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It is like you want an array of objects to represent vehicles. You can have an array of dictionaries or an array of vehicle objects.
You will probably want to go with an object, as Swift arrays and dictionaries have to be printed. So your dictionary with string keys to values of different types will be of type [String : Any]
and you will loop back and forth. This will make your array of type [[String : Any ]]
.
Using an object, you will only have an array of this type. Say your vehicle type has a name Vehicle
, which will make your array of type [Vehicle]
and every access to the array will return an instance of that type.
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If I want to try this with my own statement. Which also I want to expand my array with the data in my dictionary and only print the key from the dictionary:
var myArray = ["Abdurrahman","Yomna"]
var myDic: [String: Any] = [
"ahmed": 23,
"amal": 33,
"fahdad": 88]
for index in 1...3 {
let dict: [String: Any] = [
"key": "new value"
]
// get existing items, or create new array if doesn't exist
var existingItems = myDic[myArray] as? [[String: Any]] ?? [[String: Any]]()
// append the item
existingItems.append(myArray)
// replace back into `data`
myDic[myArray] = existingItems
}
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