Introduction
Crystal is a compiled language with Ruby-like syntax for web and performance.
Read more →Welcome to Crystal Web Dev!
Discover free crystal coding tutorials and resources. Perfect for beginners and intermediate learners looking to enhance their skills!
Basics
Installation
Crystal installation uses package managers or binaries for setup.
Read more →Running Code
Crystal code runs via crystal run or crystal build with .cr files.
Read more →Syntax
Crystal syntax uses Ruby-inspired style with type inference.
Read more →Variables
Crystal variables use dynamic typing with optional type annotations.
Read more →Data Types
Crystal data types include Int32 String and Bool with type inference.
Read more →Type Inference
Crystal type inference reduces explicit type declarations for clarity.
Read more →Constants
Crystal constants use uppercase for immutable compile-time values.
Read more →Operators
Crystal operators include arithmetic and logical with type safety.
Read more →If Else
Crystal if-else statements control flow with Ruby-like expressions.
Read more →Case
Crystal case expressions handle conditions with pattern matching.
Read more →Loops
Crystal loops use while and each with break and next.
Read more →Comments
Crystal comments use # for single-line annotations.
Read more →Errors
Crystal errors use rescue with typed exception handling.
Read more →Debugging
Crystal debugging uses puts and crystal spec for tracing.
Read more →Best Practices
Crystal best practices include type safety, minimal macros.
Read more →Security Basics
Crystal security ensures safe input handling for web apps.
Read more →Modules
Crystal modules use module for code organization and reuse.
Read more →Shards
Crystal shards are packages managed with shards.yml.
Read more →puts
Crystal puts outputs to console with string interpolation.
Read more →Functions
Functions
Crystal functions use def with typed or inferred returns.
Read more →Named Arguments
Crystal named arguments improve readability in function calls.
Read more →Default Arguments
Crystal default arguments provide fallback values in functions.
Read more →Blocks
Crystal blocks use do-end or {} for inline logic.
Read more →Procs
Crystal procs create callable objects with Proc types.
Read more →Closures
Crystal closures capture variables for stateful functions.
Read more →Generic Functions
Crystal generic functions use type parameters for polymorphism.
Read more →Macros
Macros
Crystal macros generate code at compile-time with {% %}.
Read more →Metaprogramming
Crystal metaprogramming uses macros for dynamic code generation.
Read more →Classes
Classes
Crystal classes use class with properties and methods.
Read more →Structs
Crystal structs are lightweight value types with fields.
Read more →Inheritance
Crystal inheritance uses < for single inheritance.
Read more →Modules as Mixins
Crystal modules act as mixins for shared behavior.
Read more →Enums
Crystal enums define named constants with values.
Read more →Data Structures
Arrays
Crystal arrays are dynamic collections with typed elements.
Read more →Hashes
Crystal hashes store key-value pairs with Hash type.
Read more →Tuples
Crystal tuples store fixed-length typed data.
Read more →Sets
Crystal sets store unique elements with Set type.
Read more →Strings
Crystal strings are immutable UTF-8, with String methods.
Read more →Concurrency
Fibers
Crystal fibers enable lightweight concurrency with spawn.
Read more →Channels
Crystal channels allow fiber communication with Channel.
Read more →Async Await
Crystal async/await uses fibers for non-blocking operations.
Read more →File I/O
File Reading
Crystal file reading uses File.read with error handling.
Read more →File Writing
Crystal file writing uses File.write with buffered streams.
Read more →File Paths
Crystal file paths use Path for cross-platform handling.
Read more →File Deletion
Crystal file deletion uses File.delete with error checks.
Read more →HTTP
HTTP Server
Crystal HTTP server uses Kemal or Amber for web apps.
Read more →HTTP Client
Crystal HTTP client uses HTTP::Client for API calls.
Read more →HTTP Routing
Crystal HTTP routing uses Kemal for defining endpoints.
Read more →JSON
JSON Handling
Crystal JSON handling uses JSON.parse for serialization.
Read more →JSON Parsing
Crystal JSON parsing uses JSON::Any with typed structs.
Read more →JSON Serialization
Crystal JSON serialization uses to_json with objects.
Read more →Web Development
Web Frameworks
Crystal web frameworks, like Kemal and Amber, simplify web development.
Read more →Kemal
Crystal Kemal framework provides fast routing for REST APIs.
Read more →Amber
Crystal Amber framework supports MVC for full-stack apps.
Read more →REST APIs
Crystal REST APIs use Kemal with JSON responses.
Read more →GraphQL APIs
Crystal GraphQL APIs use graphql-crystal for typed queries.
Read more →WebSockets
Crystal WebSockets use kemal-websocket for real-time apps.
Read more →Authentication
Crystal authentication uses JWT for secure API endpoints.
Read more →Environment Variables
Crystal environment variables use ENV for configuration.
Read more →CORS
Crystal CORS enables cross-origin requests with middleware.
Read more →Databases
PostgreSQL
Crystal PostgreSQL uses crystal-pg for typed queries.
Read more →SQLite
Crystal SQLite uses crystal-sqlite3 for local database queries.
Read more →MongoDB
Crystal MongoDB uses crystal-mongo for document data.
Read more →Database Connections
Crystal database connections use pools for efficiency.
Read more →ORM
Crystal ORMs like Granite simplify database queries.
Read more →Logging
Logging
Crystal logging uses Log for structured log output.
Read more →Error Logging
Crystal error logging captures exceptions with Log.error.
Read more →Request Logging
Crystal request logging tracks API calls with Kemal middleware.
Read more →Testing
Testing
Crystal testing uses spec module with describe and it.
Read more →Unit Testing
Crystal unit testing uses should for assertions.
Read more →Integration Testing
Crystal integration testing validates APIs with HTTP::Client.
Read more →Mocking
Crystal mocking uses spec mocks for isolated tests.
Read more →Benchmarking
Crystal benchmarking uses Benchmark for performance tests.
Read more →Examples
REST API
Crystal REST API with Kemal handles CRUD with JSON responses.
Read more →GraphQL API
Crystal GraphQL API with graphql-crystal supports typed queries.
Read more →Real-Time Chat
Crystal real-time chat uses Kemal WebSockets for messaging.
Read more →Authentication API
Crystal authentication API uses JWT for secure endpoints.
Read more →Database CRUD
Crystal database CRUD with PostgreSQL handles data operations.
Read more →Web App
Crystal web app uses Kemal for server-side rendering.
Read more →API Testing
Crystal API testing with HTTP::Client validates REST endpoints.
Read more →Logging Setup
Crystal logging setup with Log logs requests and errors.
Read more →Dockerized App
Crystal Dockerized app uses Dockerfile for deployment.
Read more →WebAssembly App
Crystal WebAssembly app compiles to WASM for browser use.
Read more →Explore Our Tools
Crystal Code Commenter
This page provides the Crystal Code Commenter tool. Utilize it for your tasks.
Go to tool →Crystal Code Formatter
This page provides the Crystal Code Formatter tool. Utilize it for your tasks.
Go to tool →Crystal Doc Generator
This page provides the Crystal Doc Generator tool. Utilize it for your tasks.
Go to tool →Crystal Error Explainer
This page provides the Crystal Error Explainer tool. Utilize it for your tasks.
Go to tool →Crystal Standard Library Reference
This page provides the Crystal Standard Library Reference tool. Utilize it for your tasks.
Go to tool →Crystal to Ruby Converter Preview
This page provides the Crystal to Ruby Converter Preview tool. Utilize it for your tasks.
Go to tool →Crystal Type Safety Analyzer
This page provides the Crystal Type Safety Analyzer tool. Utilize it for your tasks.
Go to tool →Crystal Web Route Explainer
This page provides the Crystal Web Route Explainer tool. Utilize it for your tasks.
Go to tool →