プログラミング言語 Erlang

Overview

Erlang is a functional programming language developed by Ericsson in the late 1980s. It is designed for building scalable, fault-tolerant, distributed real-time systems. Erlang is known for its concurrency, reliability, and fault-tolerance features, making it suitable for building telecommunications, financial, and messaging systems.

Syntax

Erlang syntax is based on pattern matching and recursion. Here are some key features of Erlang syntax:

• Variables start with an uppercase letter, and atoms (constants) start with a lowercase letter.
• Functions are defined with pattern matching clauses.
• Erlang uses the actor model for concurrency, where processes communicate by sending messages.
• Modules are used to organize code, and each module has its own namespace.

Example of a simple Erlang function:

-module(math).
-export([factorial/1]).

factorial(0) -> 1;
factorial(N) when N > 0 -> N * factorial(N - 1).

Developer Toolchain

Erlang comes with a set of developer tools that help in building, debugging, and testing Erlang applications. Some of the key tools in the Erlang developer toolchain are:

• Erlang Shell: Interactive command-line interface for evaluating Erlang expressions and testing code snippets.
• OTP (Open Telecom Platform): A set of libraries, design principles, and best practices for building scalable and fault-tolerant systems.
• Rebar3: A build tool for managing Erlang applications and dependencies.
• Dialyzer: A static analysis tool for detecting type errors and common programming mistakes.
• Observer: A graphical tool for monitoring and debugging Erlang systems.

Overall, Erlang provides a powerful platform for building highly concurrent and fault-tolerant applications, making it a popular choice for building reliable systems in various industries.