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iOS Swift Collections and Control Flow Control Flow With Conditional Statements Recap: Control Flow with Conditional Statements

Morgan Li
Morgan Li
1,277 Points
Posted by Morgan Li
Morgan Li
1,277 Points

Why do you type out "var status: String" in this question? You have not assigned anything to it at the beginning.

This is the quiz question 3 for me.

2 Answers

Heidi Puk Hermann
Heidi Puk Hermann
33,366 Points
Heidi Puk Hermann
Heidi Puk Hermann
33,366 Points

In Swift you have to assign the type to the variable/constant when you create it. This is because Swift is a type-safe language meaning that once you have defined a variable/constant and given it a type, the type cannot be changed. 

var emptyString1: String //1
var emptyString2: String = "" //2
var emptyString3 = "" //3

//1 - If you don't want to or can't assign a value when you define your variable, you just give the type and leaves it empty. //2 and //3 - These two methods are essentially the same, since we give it a value of an empty string. In the latter the explicit definition of the type has just been omitted.

Morgan Li
Morgan Li
1,277 Points
Morgan Li
Morgan Li
1,277 Points

Thanks, your explanation to //1 was what i was looking for. I didn’t know that you can define a variable but not assign anything to it.

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello Morgan,

I'm not sure where you are stuck with this question, but "var status: String" will have a value once the conditional statement has done all the checks. 

var isAvailable = true
var isCheap = true

var status: String

if !isCheap && !isAvailable {
    status = "super rare"
} else if isCheap && isAvailable {
    status = "not rare" 
// status will have a "not rare" value after evaluating all the conditions.
} else if !isCheap && isAvailable {
    status = "somewhat rare"
} else {
    status = "common"
}

Good luck