Recipe	Crates
Store Optional Values in Option
Use Adapters when Working with References
Extract the Value Contained in an Option with unwrap* and expect
Transform Values Contained within an Option
Use Option with match, if let, or while let
Common Option Methods
Implement the "Early Return" Pattern with the ? Operator

Recipe	Crates
Handle Recoverable Errors with Result
Retrieve or Transform Values in Result
Get Reference to Values Inside a Result
Result vs Option

Recipe	Crates
[RefCell][ex-standard_library-refcell]
[Cell][ex-standard_library-cell]
[OnceCell][ex-standard_library-oncecell]

Recipe	Crates
Store Data on the Heap with Box
Box Use Cases
Use Box to store Dynamically Sized Types
Implement Recursive Data Structures with Box
Use Box as a Smart Pointer to Owned Trait Objects

Recipe	Crates
Accept Either a Owned or Borrowed Value as the Input of a Function
Convert a Cow to a borrowed or owned type
Efficiently Construct a Cow with into
Modify a Cow In-place
Return a Cow from a Function

Recipe	Crates
Accept Arguments of Multiple Types with AsRef
Use as_ref to Get a Reference to the Contained Value of a Smart Pointer
AsRef vs. Deref vs. Borrow

Recipe	Crates
Derive Common Traits Automatically
Derive Additional Traits with derive_more