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I've been learning swift lately and here are a few basics.
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//////////////////////////////// //Strings + Error Protection //////////////////////////////// import UIKit /** ** ** ** ** ** ** ** ** ** ** Types of Strings ** ** ** ** ** ** ** ** ** ** **/ //Simple String or Non-Optional String var name:String name = "Chris" //Optional String var jobFunction:String? jobFunction = "Developer" //Implicitely unwrapped Optional String var jobDept:String! jobDept = "Dev Team" /** ** ** ** ** ** ** Optional String? Use Cases ** ** ** ** ** ** **/ //A. Print Optional String if(jobFunction != nil){ //Without Force Unwrapping println("Access my inner \(jobFunction)") //With Force Unwraping println("Access my inner \(jobFunction!) through unwrapping!") } else { println("jobFunction is nil") } //B. Optional-binding Syntax: if true, then assign the value to a CONSTANT if let jobTitle = jobFunction { //Since jobFunction exists, the name is assigned to jobTitle println(jobTitle) } /** ** ** ** ** ** ** Implicit String! Use Cases ** ** ** ** ** ** **/ //A. Print Implicite String if jobDept != nil { println("My department is \(jobDept)") } else { println("jobDept is nil") } //How to protect yourself from force unwrapping a nil value //B. Nil-coalescing operator: Check variable to see if it's nil. If it's not nil, use that value, otherwise, use something else let finalName = (name ?? "no name") let finalJob = (jobFunction ?? "no job")