Posts (page 136)
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4 min readIn Elixir, you can get the number of available processors by calling System.schedulers_online/0 function. This function returns the total number of schedulers that are currently online and available for running processes. By using this information, you can optimize and distribute your workload among the available processors effectively.[rating:7ad7e33a-903a-4d89-adf8-87cf278eb88d]How to dynamically adjust the number of processors used by an Elixir application.
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3 min readIn Elixir, functions are defined using the def keyword followed by the function name and parameters. Functions can have multiple clauses, which allows for pattern matching based on different inputs. When calling a function, Elixir will try each clause sequentially until it finds a match.Functions can also be defined anonymously using the fn keyword, which is commonly used in higher-order functions and passing functions as arguments to other functions.
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5 min readTo connect nodes of two docker containers in Elixir, you would first need to ensure that both containers are running the necessary Elixir application or node. Next, you can use the EPMD_PORT environment variable to set the port for the Erlang Port Mapper Daemon. This port needs to be set to the same value on both containers so that they can communicate with each other.
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7 min readTo insert XML into an Oracle database, first you need to convert the XML data into a format that can be stored in a database column. You can do this by using the XMLTYPE data type in Oracle, which allows you to store and manipulate XML data.To insert XML data into an Oracle database, you can use the INSERT INTO statement with a subquery that selects the XML data in the proper format.
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4 min readAnonymous functions are a powerful feature in Elixir that allows for creating functions without explicitly naming them. They are often used in situations where a short, one-off function is needed, such as when passing a function as an argument to another function or when defining a function inline.Anonymous functions can be useful in cases where a function is not needed to be reused elsewhere in the code base, saving the effort of defining a named function.
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2 min readTo compile a single file in Elixir, you can use the following command in your terminal:elixirc filename.exReplace "filename.ex" with the name of the Elixir file you want to compile. This command will compile the specified file and generate a corresponding BEAM bytecode file with the same name but a ".beam" extension. This bytecode file can then be executed using the Erlang virtual machine.[rating:7ad7e33a-903a-4d89-adf8-87cf278eb88d]How to compile single file in Elixir using mix.
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5 min readIn Elixir, you can get the memory location of a variable by using the :erlang.term_to_binary/1 function. This function converts any term into its binary representation, which includes information about its memory location.For example, if you have a variable named my_var, you can use :erlang.term_to_binary(my_var) to get the binary representation of my_var, which will include its memory location.Keep in mind that the memory location returned by :erlang.
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3 min readTo write to standard input in Elixir, you can use the IO module's puts or write functions. These functions allow you to write data to the standard input stream. You can also use the IO.write function to write raw data directly to the standard input stream. Additionally, you can use the IO.binwrite function to write binary data to the standard input stream. Overall, writing to standard input in Elixir is simple and can be done using the various functions provided by the IO module.
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2 min readIn Elixir, you can concatenate charlists by using the ++ operator. Charlists are lists of integers, where each integer represents a character in the list. To concatenate two charlists, simply use the ++ operator between the two lists. For example: list1 = 'hello' list2 = 'world' concatenated_list = list1 ++ list2 # Resulting charlist: 'helloworld' Remember that charlists are different from strings in Elixir, as strings are represented by double-quoted binaries.
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8 min readTo optimize views in Oracle, you can follow some best practices.Limit the number of columns - Only select the columns that are necessary for the view, as selecting unnecessary columns can impact performance.Use indexed columns - If possible, include columns that are indexed in the view to improve query performance.Avoid complex joins - Try to avoid using complex joins in the view definition, as it can slow down queries.
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4 min readIn Elixir, you can define shared constants by using the @ symbol followed by the constant name. These shared constants can be used across different modules within the same project. For example, you can define a shared constant named PI in a module like this: @PI 3.14159. This constant can then be accessed and used in other modules by referring to ModuleName.PI. This approach helps in keeping the codebase organized and consistent by centralizing commonly used values.
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7 min readIn Elixir, extending an existing protocol can be done by defining a new implementation for the protocol. When you want to extend a protocol, you need to define a new module that implements the protocol and add the implementation for the new functionality.First, you need to define the protocol with the existing functions that you want to extend. Next, create a new module that implements the protocol and add the new functions that you want to use to extend the protocol.