Posts (page 137)
-
5 min readIn Elixir, you can iterate through a list of maps using the Enum module's functions. One common approach is to use the Enum.map/2 function, which applies a given function to each element of the list and returns a new list containing the results.For example, suppose you have a list of maps representing products: products = [ %{name: "Product 1", price: 10.99}, %{name: "Product 2", price: 20.50}, %{name: "Product 3", price: 15.
-
4 min readIn Elixir, we can reduce a list of maps using the Enum.reduce/2 function. This function allows us to iterate over each element in the list and perform a specific operation on each map. By providing an initial accumulator value and a function to combine each map with the accumulator, we can effectively reduce the list to a single value.For example, if we have a list of maps representing sales data and we want to calculate the total revenue, we can use Enum.
-
4 min readIn Elixir, you can convert a float to an integer using the round/1 function from the Float module. This function takes a float as input and returns the nearest integer. For example, if you have a float value 5.6, using round(5.6) will return 6. Additionally, you can use other functions like ceil/1 to round up to the nearest integer or floor/1 to round down to the nearest integer. Just remember to import the Float module before using these functions in your code.
-
6 min readTo find the difference between two tables in Oracle, you can use the MINUS operator. This operator is used to retrieve rows from the first query that are not present in the second query.You can write a query with the MINUS operator to compare the data in two tables and return only the rows that are unique to one table. This will help you identify the differences between the two tables.For example, the query may look like this: SELECT column1, column2, ...
-
4 min readIn Elixir, you can expand multiple macros by using the use macro. By using the use macro, you can easily include multiple macros in a module without having to explicitly call each macro individually. Simply list the macros you want to expand within the use macro, separated by commas.
-
4 min readTo pass data from the terminal in Elixir, you can specify command line arguments when running your Elixir application. These command line arguments can be accessed using the System.argv function, which returns a list of strings representing the arguments passed to the application.For example, if you run the following command in the terminal: elixir my_app.exs arg1 arg2 You can access the command line arguments arg1 and arg2 in your Elixir application using System.argv.
-
6 min readIn Elixir, you can get the response time of an HTTP request by using the HTTPoison library. First, you need to make the HTTP request with HTTPoison.get/1 or HTTPoison.post/2 functions. These functions return a tuple with the response status, headers, and body.To measure the response time, you can use the :timer.tc/1 function, which returns the time in milliseconds it took to execute the given function.
-
5 min readTo modify a map in Elixir, you can use the Map.put/3 function to add or update key-value pairs in the map. This function takes three arguments: the map you want to modify, the key you want to add or update, and the value you want to set for that key.For example, if you have a map called my_map with the key :name and the value "Alice", and you want to update the value to "Bob", you can do so by calling Map.put(my_map, :name, "Bob").
-
4 min readTo get random elements from an Elixir map, you can convert the map to a list, shuffle the list using the :random library, and then take the desired number of elements from the shuffled list. This can be achieved by first using the Map.to_list() function to convert the map to a list of tuples. Then, you can use the Enum.shuffle() function from the Enum module to shuffle the list. Finally, you can use the Enum.
-
4 min readIn Oracle, you can calculate a checksum using the DBMS_CRYPTO package. This package provides various encryption and hashing functions, including checksum calculations. To calculate a checksum, you can use the DBMS_CRYPTO.HASH function, which takes the input data and a hash algorithm as parameters and returns the checksum value. The checksum value is a numeric representation of the input data that can be used to verify data integrity.
-
4 min readTo disable Elixir compiler warnings, you can use the @suppress_warnings attribute before the module definition. This attribute suppresses all warnings that the compiler would normally raise for the entire module. Alternatively, you can also use the @skip_compilation attribute to skip the compilation of a specific module, effectively disabling all warnings related to that module. Additionally, you can also use compiler flags when compiling your Elixir code to ignore specific types of warnings.
-
6 min readTo put comma separated values to a column in Oracle, you can use the LISTAGG function. This function aggregates values from multiple rows into a single string, with the values separated by a specified delimiter.