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5 min readIn Haskell, you can get the system time using the getCurrentTime function provided by the Data.Time.Clock module.To use this function, you need to import the Data.Time.Clock module into your Haskell code file. You can do this by adding the following line at the top of your file: import Data.Time.Clock Once you have imported the module, you can use the getCurrentTime function to get the current system time.
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5 min readDrawing lines in Haskell involves using the IO monad to perform imperative actions. Here's an example of how you can draw lines by manipulating the console output: import Control.
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3 min readTo create a list of numbers in Haskell, you can use the range notation or explicitly define the values in the list. Here are a few examples:Using the range notation: To generate a list of numbers from 1 to 10, you can use the range operator [1..10]. To generate a list of even numbers from 2 to 20, you can use the range operator with a step size of 2 like [2,4..20]. Using explicit definition: You can also explicitly define a list of numbers by enclosing them in square brackets.
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6 min readIn Haskell, it is not possible to directly get the index of a tuple element, as tuples are not indexed data structures. However, there are a few approaches to achieve this.One option is to use pattern matching on the tuple elements to extract the desired element and its index. For example, you can define a helper function using recursion, which takes an index as an argument, and pattern matches on each element of the tuple until the desired index is reached.
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7 min readIn Haskell, to import the math module, you need to add the following line at the top of your Haskell file: import qualified Math The keyword qualified is used to explicitly qualify the imported module name, which helps in avoiding naming conflicts if other modules have the same function names.After importing the math module, you can use the functions defined in it. For example, if math exports a function called square, you can use it as follows: result = Math.square 9 Here, Math.
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8 min readIn Haskell, you can limit recursive calls by implementing an additional parameter or wrapper function to keep track of the number of recursive calls made. This approach allows you to set a limit on the number of recursive calls and stop the recursion when that limit is reached.One way to achieve this is by using an accumulator parameter, also known as an "auxiliary function" technique.
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7 min readBuilding a Docker image with Haskell involves several steps. Here is an overview of the process:Install Docker: Begin by installing Docker on your system. Docker is a platform that allows you to build, package, and distribute applications using containerization. Create a Dockerfile: In the project directory, create a file named "Dockerfile" (with no file extension). This file will contain the necessary instructions for building the Docker image.
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6 min readTo operate with unboxed types in Haskell, you can take the following steps:Enable the -XMagicHash language extension by adding {-# LANGUAGE MagicHash #-} at the beginning of your module. Replace the boxed types with their unboxed counterparts available in the ghc-prim library. For example, replace Int with Int#, Double with Double#, and so on. Import the necessary modules to access the unboxed types. You typically need GHC.
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5 min readTo convert a nullable MutableMap to a not nullable one in Kotlin, you can follow the steps below:Firstly, check if the nullable MutableMap is not null. If it is null, you can assign an empty map to the non-nullable MutableMap. This step ensures that the non-nullable map is initialized even if the nullable map is null. val nullableMap: MutableMap<String, String>? = // nullable map val nonNullableMap: MutableMap<String, String> = nullableMap .
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9 min readIn Kotlin, there are different ways to save data that is passed from one activity to another. Here are a few approaches:Shared Preferences: Shared Preferences is a key-value storage mechanism offered by Android. It allows you to save small amounts of data, such as primitive data types or strings. To save data using Shared Preferences, you can use the getSharedPreferences method in the current activity and then store the data using the edit() and commit() methods.
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8 min readIn Kotlin, we can allow Result<T> to be a return type by utilizing generics and the sealed keyword.The Result class represents a computation that either succeeded with a value of type T, or failed with an exception. It has two subclasses: Success and Error.To define a function that returns a Result<T>, you can follow these steps:Define a sealed class Result: sealed class Result<out T> The out keyword allows us to use Result<T> as a return type.