Crystal Programming Language v1.2 Reference
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2022-04-11 08:35:33
Guides
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Guides
Database
Connection
Connection pool
Transactions
Continuous Integration
CircleCI
GitHub Actions
Concurrency
Performance
Static Linking
Testing
Writing Shards
Hosting on GitHub
Hosting on GitLab
Home
Coding style
Getting started
A Command Line Application
An HTTP Server
Governance document
Platform Support
The shards command
Using the compiler
Specification
Annotations
Built-in annotations
Assignment
Comments
Compile-time flags
Cross-compilation
Control expressions
&&
case
if
As an expression
As a suffix
if var
if var.is_a?(…)
if var.responds_to?(…)
if var.nil?
if !
Ternary if
||
Truthy and falsey values
unless
until
while
break
next
C bindings
alias
Callbacks
Constants
enum
fun
out
to_unsafe
lib
struct
type
union
Variables
Documenting code
Exception handling
Literals
Array
Bool
Char
Command
Floats
Hash
Integers
NamedTuple
Nil
Proc
Range
Regex
String
Symbol
Tuple
Local variables
Low-level primitives
Uninitialized variable declaration
instance_sizeof
offsetof
pointerof
sizeof
Macros
Fresh variables
Hooks
Macro methods
About this guide
Requiring files
Types and methods
alias
Blocks and Procs
Block forwarding
Capturing blocks
Closures
Proc literal
Classes and methods
Class methods
Class variables
Default parameter values and named arguments
Method arguments
finalize
Inheritance
Virtual and abstract types
Methods and instance variables
new, initialize and allocate
Operators
Overloading
Return types
Splats and tuples
Type inference
Type restrictions
Union types
Visibility
Constants
Enums
Everything is an object
Generics
Modules
Structs
The Program
Type grammar
Type reflection
as
as?
is_a?
nil?
responds_to?
typeof
Unsafe code
Tutorials
Basics
Hello World
Variables
Math
Strings
Control Flow
Methods
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