Erlang in general is used to program highly distributed and fault tolerant systems. Even though it has its roots in the telecommunication industry, it has proven useful in several other sites like ejabbered, Facebook chat etc.
Modules are a bunch of functions regrouped in a single file, under a single name. Additionally, all functions in Erlang must be defined in modules.
Most computer programming languages support recursion by allowing a function to call itself within the program text.
In mathematics and computer science, a higher-order function (also functional form, functional or functor) is a function that does at least one of the following: takes one or more functions as an input.
Erlang was developed at Ericsson and was designed from the ground up for writing scalable, fault-tolerant, distributed, non-stop, soft-realtime applications.
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