Posts (page 127)
-
4 min readIn Rust programming, "0is" notation is a shorthand way of representing the values of an enum or algebraic data type. It is a way of defining constants or values for each variant of the enum, where the first variant is represented as 0is, the second variant as 1is, and so on. This notation allows for easier enumeration and pattern-matching when working with enums in Rust code.[rating:c1abfe4e-5b23-47e2-a608-65097a225475]How does 0is notation impact performance in Rust.
-
3 min readIn Elixir, you can join an enumerated list of characters using the Enum.join/2 function. This function takes two arguments - the list of characters and a delimiter that will be used to separate the characters in the resulting string.For example, if you have a list of characters like ['a', 'b', 'c'] and you want to join them with a comma, you can do so like this: char_list = ['a', 'b', 'c'] joined_string = Enum.
-
5 min readTo iterate over prefixes and suffixes of a string in Rust, you can use the windows method for slices. This method allows you to create an iterator over slices of a specified size from the original slice.To iterate over prefixes, you can use the windows method with a range from 1 to the length of the string. This will give you all possible prefixes of the string starting from length 1.
-
5 min readTo check memory usage in Elixir, you can use the :erlang.memory and :erts_debug.size functions. The :erlang.memory function provides information about the total memory usage of the Erlang VM, while the :erts_debug.size function can be used to get detailed information about how much memory is being used by specific data structures in the VM. By using these functions, you can analyze the memory usage of your Elixir application and identify any potential memory leaks or inefficiencies.
-
4 min readTo create a fixed size mutable stack allocated string in Rust, you can use fixed-size arrays. Rust provides support for fixed-size arrays using the [T; N] syntax, where T is the type of elements in the array and N is the number of elements.
-
2 min readTo get a list of all map keys in Elixir, you can use the Map.keys/1 function. This function takes a map as an argument and returns a list of all keys in that map. You can then perform any operations you need on this list of keys.[rating:4418d73d-f96d-4383-97bd-2aa68e7b6810]How to extract keys as a separate list from a map in Elixir?You can extract keys as a separate list from a map in Elixir using the Map.keys/1 function. Here's an example: map = %{a: 1, b: 2, c: 3} keys = Map.keys(map) IO.
-
6 min readIn Rust, you can execute code after an async function by using the await keyword in combination with the tokio::spawn function. By spawning a new asynchronous task, you can run code after the async function completes without blocking the main execution thread. This allows you to execute code concurrently and handle the result of the async function once it completes.
-
4 min readYou can use multiple macros inside macros in Rust by nesting them within each other. This allows you to create more complex and customized macros for your code. To do this, simply define one macro within another macro by enclosing the inner macro's code within curly braces inside the outer macro's code. This way, you can create a chain of macros that work together to achieve the desired functionality.
-
6 min readIn Elixir, you can create a map in a loop using the Enum.reduce/3 function. This function allows you to iterate over a collection and build a new map based on the elements of the original collection.To create a map in a loop, you can start by defining an empty map as the initial accumulator. Then, you can use the Enum.reduce/3 function to iterate over a list or other enumerable collection, and update the accumulator with each iteration.
-
5 min readIn Rust, you can specify value constraints using the where clause in a generic type. By using the where clause, you can define conditions that the generic type must meet in order to be valid. This allows you to ensure that certain properties or functionalities are present in the type that is being used with the generic.For example, you can specify constraints on types and traits, such as requiring a type to implement a specific trait or have a certain property, like being Copy or Debug.
-
2 min readTo get digits past the decimal in Elixir, you can use the Float.round/2 function along with the :precision option. This function rounds a float to a specified number of decimal places.For example, if you have a float number and you want to get the digits up to 2 decimal places, you can use the following code: rounded_number = Float.round(number, 2) This will round the number to 2 decimal places and store it in the rounded_number variable.
-
6 min readIn Rust, you can check if an object is a primitive data type by using the std::mem::size_of function. This function returns the size of a type in bytes, so if the size of the type is a fixed value, it indicates that the type is a primitive data type. For example, integers like i32 and u8 have fixed sizes, so you can use std::mem::size_of::<i32>() or std::mem::size_of::<u8>() to check if an object is of a primitive data type.