Erlang Online Test

Syntax and Semantics: Erlang has a unique syntax derived from Prolog. Understanding its syntax and semantics is crucial for writing correct and efficient Erlang code. This includes knowledge of atoms, variables, tuples, and lists, as well as comprehending Erlang's evaluation rules and execution model.

Data Types and Pattern Matching: Erlang's type system includes numbers, atoms, tuples, lists, and more. Pattern matching is a powerful feature used extensively in Erlang for destructuring data and flow control. Proficiency in these areas enables developers to write concise and expressive code.

Concurrent Programming: Erlang excels at concurrent programming with its lightweight processes and message passing model. Understanding how to create, manage, and coordinate multiple processes is essential for building scalable and fault-tolerant systems. This skill is particularly important for developing distributed applications.

Error Handling: Erlang's 'Let it crash' philosophy and robust error handling mechanisms are key to building reliable systems. Familiarity with try-catch expressions, supervisors, and the OTP behaviors for error handling is crucial. This knowledge allows developers to create self-healing systems that can recover from failures gracefully.

Standard Library Functions: Erlang's standard library provides a rich set of functions for common tasks. Proficiency in using these functions efficiently can significantly improve code quality and development speed. Key areas include string manipulation, file I/O, and data structure operations.

OTP Framework: The Open Telecom Platform (OTP) is a set of libraries and design principles for building robust, scalable applications. Understanding OTP behaviors like gen_server, gen_statem, and supervisors is crucial for developing production-grade Erlang systems. This framework forms the backbone of many large-scale Erlang applications.

Erlang Shell: The Erlang shell is an interactive environment for experimenting with Erlang code. Proficiency in using the shell for debugging, testing, and exploring Erlang features is valuable. It allows developers to quickly prototype ideas and inspect runtime behavior.

Functional Programming Concepts: Erlang is a functional programming language, emphasizing immutability and recursion. Understanding functional concepts like higher-order functions, closures, and tail recursion optimization is essential. These principles enable developers to write clean, modular, and efficient code.

Message Passing: Erlang's concurrency model is built on message passing between processes. Mastery of sending and receiving messages, along with understanding mailbox management, is crucial. This skill is fundamental for building distributed and fault-tolerant systems.

Distributed Systems: Erlang provides built-in support for distributed computing. Knowledge of node communication, global process registration, and distributed OTP applications is important. This enables developers to build systems that can scale across multiple machines and recover from network partitions.

Performance Optimization: Optimizing Erlang applications requires understanding of the BEAM virtual machine, memory management, and concurrency patterns. Proficiency in using Erlang's profiling tools and applying optimization techniques is crucial for building high-performance systems.

Testing and Debugging: Erlang provides tools like EUnit for unit testing and the Debugger for interactive debugging. Understanding how to write effective tests and use debugging tools is essential for developing reliable Erlang applications. This skill ensures code quality and helps in identifying and fixing issues efficiently.