All Files

Remove unnecessary whitespace from the end of lines.
- Use git diff --check to look for these before committing.
- Note that two trailing spaces is intentional in markdown documents to create a line break like <br>, so these should not be removed.
End each file with a newline character.

Swift

Avoid force unwrapping optionals with ! in production code
- Production code is what gets shipped with the app. Basically, everything under the mas-cli/ folder.
- However, force unwrapping is encouraged in tests for less code and tests should break when any expected conditions aren't met.
Prefer structs over classes wherever possible
Default to marking classes as final
Prefer protocol conformance to class inheritance
Break long lines after 120 characters
Use 4 spaces for indentation
Use let whenever possible to make immutable variables
Name all parameters in functions and enum cases
Use trailing closures
Let the compiler infer the type whenever possible
Group computed properties below stored properties
Use a blank line above and below computed properties
Group methods into specific extensions for each level of access control
When capitalizing acronyms or initialisms, follow the capitalization of the first letter.
When using Void in function signatures, prefer () for arguments and Void for return types.
Prefer strong IBOutlet references.
Avoid evaluating a weak reference multiple times in the same scope. Strongify first, then use the strong reference.
Prefer to name IBAction and target/action methods using a verb describing the action it will trigger, instead of the user action (e.g., edit: instead of editTapped:)