Crystal Programming Language v1.13 Documentation
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2024-08-10 09:44:24
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Welcome
Guides
Runtime Tracing
Testing
Database
Transactions
Connection
Connection pool
Writing Shards
Hosting on GitHub
Hosting on GitLab
Crystal for Rubyists
Metaprogramming Help
Concurrency
Continuous Integration
CircleCI
GitHub Actions
Performance
Static Linking
Coding style
Manuals
Using the Compiler
The Shards Command
Required libraries
Release Policy
Platform Support
Tutorials
Getting started
An HTTP Server
A Command Line Application
Language introduction
Math
Methods
Variables
Strings
Control Flow
Hello World
Specification
About this guide
Unsafe code
Compile-time flags
Cross-compilation
Control expressions
select
case
unless
while
break
next
Truthy and falsey values
if
if var
if !
As an expression
Ternary if
if var.nil?
As a suffix
if var.responds_to?(…)
if var.is_a?(…)
||
until
&&
Literals
NamedTuple
Bool
Proc
Hash
Nil
Tuple
Symbol
String
Integers
Char
Floats
Command
Array
Range
Regex
Type grammar
Exception handling
Annotations
Built-in annotations
C bindings
type
fun
to_unsafe
out
Callbacks
alias
Constants
Variables
struct
union
lib
enum
Macros
Macro methods
Hooks
Fresh variables
Assignment
Comments
Requiring files
Type reflection
responds_to?
nil?
as?
is_a?
typeof
as
Type autocasting
Low-level primitives
instance_alignof
pointerof
alignof
Uninitialized variable declaration
sizeof
instance_sizeof
offsetof
asm
Documenting code
Types and methods
Constants
Enums
alias
Generics
Blocks and Procs
Closures
Proc literal
Capturing blocks
Block forwarding
Classes and methods
Operators
Methods and instance variables
Overloading
Class variables
new, initialize and allocate
Default parameter values and named arguments
Inheritance
Virtual and abstract types
Union types
Return types
Class methods
finalize
Visibility
Splats and tuples
Method arguments
Type restrictions
Type inference
Structs
Everything is an object
Modules
The Program
Local variables
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