Crystal Programming Language v1.5 Documentation
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Tutorials

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    • Welcome
      • The shards command
      • Using the compiler
      • Platform Support
      • Getting started
        • An HTTP Server
        • A Command Line Application
      • Governance document
      • Coding style
    • Guides
      • Database
        • Connection pool
        • Connection
        • Transactions
      • Continuous Integration
        • GitHub Actions
        • CircleCI
      • Static Linking
      • Performance
      • Writing Shards
        • Hosting on GitLab
        • Hosting on GitHub
      • Concurrency
      • Testing
    • Specification
      • The Program
      • Assignment
      • Type grammar
      • Unsafe code
      • About this guide
      • Annotations
        • Built-in annotations
      • Local variables
      • Type reflection
        • is_a?
        • as
        • as?
        • nil?
        • responds_to?
        • typeof
      • Literals
        • Command
        • Proc
        • Range
        • Tuple
        • Symbol
        • String
        • NamedTuple
        • Bool
        • Nil
        • Regex
        • Floats
        • Array
        • Char
        • Hash
        • Integers
      • Control expressions
        • if
          • if !
          • if var
          • if var.responds_to?(…)
          • if var.nil?
          • As a suffix
          • if var.is_a?(…)
          • Ternary if
          • As an expression
        • ||
        • case
        • until
        • Truthy and falsey values
        • while
          • next
          • break
        • &&
        • unless
      • Requiring files
      • Exception handling
      • Documenting code
      • Comments
      • Types and methods
        • alias
        • Enums
        • Modules
        • Blocks and Procs
          • Closures
          • Block forwarding
          • Proc literal
          • Capturing blocks
        • Constants
        • Structs
        • Everything is an object
        • Classes and methods
          • Type inference
          • Overloading
          • Methods and instance variables
          • Class variables
          • Union types
          • Operators
          • finalize
          • Splats and tuples
          • Type restrictions
          • Method arguments
          • Inheritance
            • Virtual and abstract types
          • new, initialize and allocate
          • Return types
          • Visibility
          • Class methods
          • Default parameter values and named arguments
        • Generics
      • Type autocasting
      • C bindings
        • type
        • alias
        • lib
        • struct
        • union
        • Variables
        • fun
          • out
          • to_unsafe
        • Callbacks
        • enum
        • Constants
      • Compile-time flags
        • Cross-compilation
      • Low-level primitives
        • sizeof
        • Uninitialized variable declaration
        • offsetof
        • instance_sizeof
        • pointerof
      • Macros
        • Hooks
        • Macro methods
        • Fresh variables
    • Tutorials
      • Basics
        • Strings
        • Hello World
        • Math
        • Methods
        • Variables
        • Control Flow
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