Dictionary

var someDict:[Int:String] = [1:"One", 2:"Two", 3:"Three"]

var someVar = someDict[1]

print( "Value of key = 1 is \(someVar)" )
print( "Value of key = 2 is \(someDict[2])" )
print( "Value of key = 3 is \(someDict[3])" )

// 2. UPADTE KEY VALUE DICTIONARY

var oldVal = someDict.updateValue("Divakar", forKey : 1)

var someVar1 = someDict[1]

print( "Old value of key = 1 is \(oldVal)" )
print( "Value of key = 1 is \(someVar1)" )
print( "Value of key = 2 is \(someDict[2])" )

// 3. MODIFY THE EXISTING ELEMENT OF DICTIONARY
var oldVal2 = someDict[1]
someDict[1] = "New value of one"
var someVar2 = someDict[1]

print( "Old value of key = 1 is \(oldVal2)" )
print( "Value of key = 1 is \(someVar2)" )
print( "Value of key = 2 is \(someDict[2])" )
print( "Value of key = 3 is \(someDict[3])" )

// 4. remove a key-value pair from a dictionary.
var removedValue = someDict.removeValue(forKey :2)

print( "Value of key = 1 is \(someDict[1])" )
print( "Value of key = 2 is \(someDict[2])" )
print( "Value of key = 3 is \(someDict[3])" )

// 5. ITERATE
for (key, value) in someDict {
   print("Dictionary key \(key) -  Dictionary value \(value)")
}

// 6. separate arrays for both keys and values
let dictKeys = [Int](someDict.keys)
let dictValues = [String](someDict.values)

print("Print Dictionary Keys")

for (key) in dictKeys {
   print("\(key)")
}

print("Print Dictionary Values")

for (value) in dictValues {
   print("\(value)")
}

//7. COUNT 
var someDict1:[Int:String] = [1:"One", 2:"Two", 3:"Three"]
var someDict2:[Int:String] = [4:"Four", 5:"Five"]

print("Total items in someDict1 = \(someDict1.count)")
print("Total items in someDict2 = \(someDict2.count)")

// 8. isEmpty
var someDict3:[Int:String] = [Int:String]()

print("someDict1 = \(someDict1.isEmpty)")
print("someDict2 = \(someDict2.isEmpty)")
print("someDict3 = \(someDict3.isEmpty)")

-----------------------------------------------------
9. Passing dictionary from one function to another and get data

CODE </ >
 
 var globalDict = [String:Int]()
func first(){
    let stringsAsInts: [String:Int] = [
    "zero" : 0,
    "one" : 1,
    "two" : 2,
    "three" : 3,
    "four" : 4,
    "five" : 5,
    "six" : 6,
    "seven" : 7,
    "eight" : 8,
    "nine" : 9
]
    globalDict = stringsAsInts
}
func second(){

    first()
//     print(globalDict)
    let zero: Any! = globalDict["zero"] // Optional(0)
print(zero)  
    let one: Int! = globalDict["one"] // Optional(0)
print(one)  
    let two: Int! = globalDict["two"] // Optional(0)
print(two)  
    let nine: Int! = globalDict["nine"] // Optional(0)
print(nine)  
  
}
 second()