Crystal Programming Language v1.5 Documentation
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2022-07-10 22:43:39
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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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