Optionals and Unwrapping optionals in swift

(map/flatmap/optional chaining/optional binding/ Optional casting and optional error handling)

What is optional?

How to create an Optional?

optionalString has a value or there isn’t a value.

What are the ways to unwrap optionals?

Forced Unwrapping:- Unsafe.

Optional Binding:- Safe

Optional Chaining:- Safe

Sample example for optional chaining.

With implicitly unwrapped optionals, using ! :- Unsafe

Nil coalescing operator:- Safe

Unwrapping using higher order function:- Safe

How Optional is used for Error Handling?

What is Optional Casting?

How can we use switch statement with optional?

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