How is optional binding used in swift?

Question

In swift the following syntax is allowed for flow control

if let constantName = someOptional {
    statements
}

In this context wh

Answer 1

From the Apple Doc

Optional Binding

To conditionally bind the wrapped value of an Optional instance to a new variable, use one of the optional binding control structures, including if let, guard let, and switch.

if let starPath = imagePaths["star"] {
    print("The star image is at '\(starPath)'")
} else {
    print("Couldn't find the star image")
}

Optional Chaining

To safely access the properties and methods of a wrapped instance, use the postfix optional chaining operator (postfix ?). The following example uses optional chaining to access the hasSuffix(_:) method on a String? instance.

        if let isPNG =imagePaths["star"]?.hasSuffix(".png") {
            print("The star image is in PNG format")
        }
        // Prints "The star image is in PNG format"