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Top 15 Erlang Interview Questions for 2022

1) What is Erlang÷

Erlang is an open source programming language. It is used to build massively scalable soft real-time systems. It has runtime environment. It supports concurrency, fault tolerance and distribution.

2) What are the uses of Erlang÷

The uses of Erlang are given below:
  • Telecoms
  • Banking
  • E-commerce
  • Computer telephony etc.

3) Who developed Erlang÷

Erlang developed by Joe Armstrong, Robert Virding and Mike Williams in 1986.

4) Why we should use Erlang÷

We should use Erlang because of its features:
  • It is used to develop our application.
  • It handles a large number of concurrent actives.
  • It provides us to make the application fault-tolerant.
  • It is easy to upgrade and reconfigure.

5) How to create a simple program in Erlang÷

The following codes for create a simple program:
% hello world program  
-module?helloworld).   
-export?[start/0]).   
start?) ->   
   io:fwrite?"Hello, world!\n").

6) How to import statement in Erlang÷

The following code is used to import statement in Erlang:
-import ?modulename, [functionname/parameter]).

7) How can we comment a single line÷

We can comment a single line by using % symbols. Example:
% hello world program

8) What are the functions for Erlang shell÷

There are following functions for Erlang shell:
  • b?) : It is used to print the current variable binding.
  • f?) : It is used to remove all current variable bindings.
  • h?): It is used to print the history of all the command executed.

9) What is pattern matching÷

Pattern matching is used to bind to the value. It occurs while evaluating a function call.

10) What are the ways to include a files in Erland÷

There are two ways to include a file in Erland.
include ?File).
include_lib ?File).

11) What is PID datatype in Erlang÷

PID stands for process identifier datatype. It is used for unique process identifiers which are assigning to every process.

12) How to create a module in Erlang÷

The following syntax is used to create a module. Syntax:
-module?modulename)

13) What is OTP in Erlang÷

OTP stands for open telecom platform. It is a set of Erlang libraries and design principles providing middile-ware to develop system collection of libraries open source platform.

14) What are the methods of I/O in Erlang÷

There are various methods of I/O in Erlang:
I/O Methods Description
file_read It is used to read all the contents of a file.
write It is used to write the contents to a file.
copy It is used to delete an existing file.
delete It is used to delete an existing file.
list_dir It is used to list down the contents of a particular directory.

15) What is the command to disconnect node in Erlang÷

In Erlang, erlang: disconnect_node ?Node) command is used to disconnect node in Erlang.



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