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9 min readIn Erlang, functions are defined using the fun keyword followed by the function name, arguments, and the function body. Here's an example: Sum = fun (X, Y) -> X + Y end. In this example, we define a function called Sum that takes two arguments (X and Y) and returns their sum.To call a function in Erlang, you simply write the function name followed by the arguments in parentheses. For example: Result = Sum(2, 3).
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6 min readIn Erlang, variables are declared using the pattern matching syntax. You can assign a value to a variable by using the equals sign (=) operator. Unlike many other programming languages, Erlang variables are not mutable, meaning their values cannot be changed once assigned.To declare a variable, you simply assign a value to it using the equals sign. For example, to declare a variable named "X" and assign the value 5 to it: X = 5.
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9 min readSetting up a basic Erlang project involves a few steps:Install Erlang: Begin by installing the Erlang programming language on your system. Visit the official Erlang website and download the appropriate installer for your operating system. Follow the installation instructions to complete the setup. Create a Project Directory: Create a new directory to hold your Erlang project. This directory will serve as the root directory for your project.
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6 min readTo install Erlang Observer on a Mac, you can follow these steps:The first step is to download and install Erlang. You can visit the official Erlang website (https://www.erlang.org/downloads) and download the latest stable version for Mac. Once Erlang is installed, open the terminal on your Mac. In the terminal, execute the following command to access the Erlang shell: erl In the Erlang shell, execute the following command to start the Observer application: observer:start().
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6 min readTo check whether an input is a string in Erlang, you can make use of the is_binary/1 and is_list/1 functions, which are built-in functions in Erlang. Here is a description of how you can check whether the input is a string:First, you need to ensure that the input is either a list or a binary. Strings in Erlang are represented as lists of characters or binaries (UTF-8 encoded). To check if the input is a list (string represented as a list of characters), use the is_list/1 function.
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4 min readIn Erlang, you can multiply lists of lists together by using list comprehensions or recursive functions. Here's an explanation of the process:Using list comprehensions: Define two lists of lists that you want to multiply, for example, ListA and ListB. Iterate over both lists simultaneously using a list comprehension. Multiply corresponding elements from each list and create a new list containing the multiplied values. Repeat this process for each inner list.
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6 min readTo remove surrounding quotes from a string in Erlang, you can use the string:strip/2 function along with the both option. Here's an example: -module(my_module). -export([remove_surrounding_quotes/1]). remove_surrounding_quotes(Str) -> string:strip(Str, both, $"). In the code above, the remove_surrounding_quotes/1 function takes a string Str as input and uses the string:strip/2 function to remove surrounding quotes.
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7 min readTo execute the Erlang command using Python, you can make use of the subprocess module in Python. The subprocess module allows you to create new processes, connect to their input/output/error pipes, and obtain their return codes.Here is an example of how to execute the Erlang command using Python:Import the subprocess module: import subprocess Define the Erlang command as a string: erlang_command = "erl -eval 'io:format(\"Hello, World.
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5 min readTo run a module in Erlang, you need to follow these steps:Start by compiling the Erlang source code file (.erl) that contains the module you want to run. You can use the Erlang compiler command "erlc" for this purpose. For example, if your module is in a file named "module.erl", you can compile it by running the command "erlc module.erl". This will generate a compiled file named "module.beam".
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5 min readIn Erlang, you can get the extension from a string filename using the following steps:Start by importing the file library module with the following line of code: -include_lib("kernel/include/file.hrl"). Define a function that takes a filename as a string parameter and returns its extension: get_extension(FileName) -> case filename:split_extension(FileName) of {Base, Extension} -> Extension; _ -> "" end.
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9 min readConcurrency in Erlang is a powerful feature that allows multiple processes to execute simultaneously and independently. Here are some guidelines to correctly use concurrency in Erlang:Processes: Erlang uses lightweight processes, also known as green threads, to achieve concurrency. These processes are not operating system processes, but rather Erlang runtime entities that are managed by the virtual machine.