Other
- Sequence
- Check if variable is nil?
- Single quotes vs double quotes
- No type-checking?
- Divide by zero is Infinity
- Require other files
- List Methods
- Checking the slides
- Crystal mine
- Ameba Linter
- Gravatar
- Try Crystal
- STDERR, STDOUT
- Return Boolean
- Symbols
- Docspec
- require
- Constants
- Multiple assignment
- Chained assignment
- Int methods: Times
- Int64 Zero
- Question mark: ?
- Exclamation mark: !
- Ampersand: &
- STDIN don't accept nil
- Math
- Proc
- Enums
- Type of array elements
- Environment variables
- Int32 or Nil
- Resources