Crystal Programming Language v1.6 Documentation
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Specification
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2023-08-04 21:23:50
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Welcome
Manuals
The Shards Command
Using the Compiler
Guides
Testing
Writing Shards
Hosting on GitLab
Hosting on GitHub
Performance
Coding style
Database
Connection
Connection pool
Transactions
Continuous Integration
CircleCI
GitHub Actions
Static Linking
Crystal for Rubyists
Metaprogramming Help
Concurrency
Tutorials
Getting started
A Command Line Application
An HTTP Server
Language introduction
Methods
Hello World
Math
Strings
Control Flow
Variables
Specification
Local variables
Macros
Macro methods
Fresh variables
Hooks
Assignment
Control expressions
if
if var
if var.is_a?(…)
Ternary if
As a suffix
As an expression
if var.responds_to?(…)
if var.nil?
if !
case
until
&&
||
unless
Truthy and falsey values
while
next
break
Low-level primitives
instance_sizeof
offsetof
Uninitialized variable declaration
pointerof
sizeof
Types and methods
Classes and methods
Methods and instance variables
finalize
Union types
Splats and tuples
Default parameter values and named arguments
Method arguments
Visibility
new, initialize and allocate
Class methods
Overloading
Type restrictions
Inheritance
Virtual and abstract types
Type inference
Operators
Class variables
Return types
Structs
Constants
Blocks and Procs
Proc literal
Block forwarding
Capturing blocks
Closures
Everything is an object
Generics
Modules
Enums
alias
The Program
Literals
Char
Range
String
Hash
Nil
Tuple
NamedTuple
Array
Bool
Proc
Command
Regex
Symbol
Floats
Integers
Type autocasting
Annotations
Built-in annotations
Compile-time flags
Cross-compilation
Platform Support
Requiring files
About this guide
Type reflection
as?
typeof
is_a?
as
responds_to?
nil?
Type grammar
C bindings
alias
struct
enum
Constants
lib
Variables
type
union
fun
out
to_unsafe
Callbacks
Documenting code
Comments
Exception handling
Unsafe code
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