# Alef

> discontinued concurrent programming language, designed as part of the Plan 9 operating system

**Wikidata**: [Q1895587](https://www.wikidata.org/wiki/Q1895587)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Alef_(programming_language))  
**Source**: https://4ort.xyz/entity/alef

## Summary
Alef is a discontinued concurrent programming language designed as part of the Plan 9 operating system. Developed in 2010, it emphasized static and strong typing and influenced later languages like Go. It is no longer in active use.

## Key Facts
- **Inception**: 2010 (references: Plan 9 documentation and Wikipedia archives).
- **Discontinued**: No longer maintained or used in modern software development.
- **Operating System**: Designed for Plan 9, with its first edition released in 1992.
- **Influences**: Derived from Newsqueak (1980) and contributed to the design of Go (2009).
- **Typing Discipline**: Static typing and strong typing.
- **Programming Paradigm**: Supported concurrent computing and structured programming.
- **Publication Date**: 2010, referenced in Plan 9's official documentation.

## FAQs
### Q: When was Alef created?
A: Alef was developed in 2010 as part of the Plan 9 operating system, though its design roots trace back to earlier work on concurrent programming.

### Q: Why is Alef no longer used?
A: Alef is discontinued and replaced by more modern languages like Go, which adopted some of its concurrency concepts but improved usability and adoption.

### Q: What operating system was Alef designed for?
A: Alef was specifically created for the Plan 9 operating system, a research project focused on distributed computing and simplicity.

## Why It Matters
Alef played a role in advancing concurrent programming concepts, particularly within the context of the Plan 9 operating system. Its design emphasized simplicity and efficiency in handling parallel tasks, reflecting the experimental ethos of Plan 9. Although it never gained widespread adoption, Alef influenced the development of Google’s Go programming language, which carried forward its focus on concurrency but addressed usability and scalability challenges. Studying Alef provides insights into early attempts to manage complexity in distributed systems and the evolution of programming paradigms for modern hardware.

## Notable For
- **Concurrent Programming Focus**: Designed to manage parallel tasks efficiently, reflecting Plan 9’s distributed computing goals.
- **Static and Strong Typing**: Enforced strict type checking to reduce runtime errors, a notable choice for its time.
- **Influence on Go**: Concepts from Alef, such as lightweight goroutines, were refined in Go to achieve broader adoption.
- **Plan 9 Integration**: Developed as a core component of the Plan 9 ecosystem, emphasizing interoperability with its unique architecture.

## Body

### Origin and Design
Alef was created in 2010 as part of the Plan 9 operating system, a research project initiated at Bell Labs. It built on the earlier Newsqueak language (1980), incorporating concurrency primitives to support Plan 9’s distributed computing model. The language emphasized **static typing** and **strong typing** to ensure reliability in complex systems.

### Key Features
- **Concurrency Model**: Supported lightweight threads for parallel execution, a precursor to Go’s goroutines.
- **Structured Programming**: Encouraged modular code organization through strict syntax and scoping rules.
- **Plan 9 Integration**: Designed to work seamlessly with Plan 9’s infrastructure, including its file system and network transparency.

### Discontinuation and Legacy
Alef fell out of use as Plan 9 itself remained a niche system. However, its ideas persisted:
- **Go Language**: Developers of Go (2009) cited Alef as an influence, particularly in its approach to concurrency.
- **Academic Impact**: Alef served as a case study in language design for distributed systems, highlighting both innovative concepts and practical limitations.

### Technical Specifications
- **Typing**: Static and strong typing enforced at compile time.
- **Paradigm**: Concurrent computing, with first-class support for parallelism, and structured programming.
- **Documentation**: Formally documented in Plan 9’s 2010 release materials, with historical references in early editions dating to 1992.

## References

1. [Source](https://9p.io/plan9/about.html)
2. Freebase Data Dumps. 2013