Commit c5f5332

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done with optionals and optional chaining

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Original file line number	Diff line number	Diff line change
`@@ -112,7 +112,10 @@ if let intValue = zee {`
`112`	`112`
`113`	`113`	`var imageView = UIImageView()`
`114`	`114`
	`115`	`+`
`115`	`116`	`imageView.image = UIImage(named:"puppy_in_box")`
	`117`	`+`
	`118`	`+`
`116`	`119`	`if let image = imageView.image {`
`117`	`120`	`let size = image.size`
`118`	`121`	`} else {`
`@@ -122,6 +125,9 @@ imageView.image`
`122`	`125`
`123`	`126`	`//: ### Optional Chaining`
`124`	`127`	`// Example 1`
	`128`	`+`
	`129`	`+// https://stackoverflow.com/questions/25828301/how-is-swift-if-let-evaluated`
	`130`	`+`
`125`	`131`	`var anotherImageView = UIImageView()`
`126`	`132`	`anotherImageView.image = UIImage(named:"puppy_in_box")`
`127`	`133`
`@@ -159,6 +165,13 @@ class BetterViewController: UIViewController {`
`159`	`165`	`var myButton: UIButton!`
`160`	`166`	`}`
`161`	`167`
	`168`	`+//: ### DownCasting`
	`169`	`+class Beverage {`
	`170`	`+ var category: String`
	`171`	`+`
	`172`	`+`
	`173`	`+`
	`174`	`+}`
`162`	`175`	`//: ### Optionals can be passed as parameters to functions`
`163`	`176`
`164`	`177`	`// Example: Picking up groceries in an optional car`

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