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Add notes on when Erlang began and became Open Source. (#33270)

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Paniscus Ateles
2019-07-19 22:27:54 +01:00
committed by Quincy Larson
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guide/english/erlang/index.md
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@ -3,12 +3,15 @@ title: Erlang
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## Erlang
Erlang is a functional programming language, developed by Ericsson for use in telecom applications. Because they felt that it's unacceptable for a telecom system to have any significant downtime, Erlang was built to be (among other things):
Erlang is a concurrent functional programming language developed by Ericsson for use in telecom applications. Because they felt that it was unacceptable for a telecom system to have any significant downtime, Erlang was built to be (among other things):
* distributed and fault-tolerant _(a piece of failing software or hardware should not bring the system down)_
* concurrent _(it can spawn many processes, each executing a small and well-defined piece of work, and isolated from one another but able to communicate via messaging)_
* hot-swappable _(code can be swapped into the system while it's running, leading to high availability and minimal system downtime)_
Erlang has been in development since 1986. It became Open Source in 1998 and is available today under the Apache Licence 2.0.
### Syntax
Erlang makes heavy use of **recursion**. Since data is immutable in Erlang, the use of `while` and `for` loops (where a variable needs to keep changing its value) is not allowed.