Crystal Programming Language v1.12 Documentation
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Specification

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