Posts (page 226)
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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.
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3 min readTo loop over a Map<String, Array<Any>> in Kotlin, you can follow these steps:Obtain a reference to the map you want to loop over. val map: Map> = // your map initialization Iterate over the entries of the map using forEach loop. map.forEach { (key, value) -> // Perform operations for each entry } Within the loop, each entry's key and value can be accessed using destructuring declaration. map.
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6 min readTo attach an XML file in RecyclerView using Kotlin, you can follow these steps:Create a new XML layout file that represents the layout of an individual item in RecyclerView. This file will define the visual appearance of each item. In your Kotlin code, create a RecyclerView instance in your activity or fragment layout. Give it an ID so that you can reference it in your code later. Create a new Kotlin class that extends RecyclerView.Adapter.
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9 min readIn Kotlin, passing mutable lists of objects via intents allows you to share the list data between different activities or components in your Android application. Here's how you can achieve this:Create your custom object class: Begin by creating a custom object class that represents the data you want to pass in the list. This class should implement the Parcelable interface in order to be transferred via intents.
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11 min readImplementing domain entities in Kotlin follows the same principles as in any object-oriented programming language. Domain entities represent the core components of a system that encapsulate business logic and state. Here are the steps to implement domain entities in Kotlin:Define a class for the domain entity: Create a Kotlin class that represents your domain entity. Think about the essential attributes and behavior that define the entity.
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6 min readIn Kotlin, finding overloaded operators can be accomplished by following a few steps:Identify the data types involved: Consider the data types for which you want to find overloaded operators. It can be any type, including classes, built-in types, or custom types. Look for the operator functions in the documentation: Kotlin provides a set of predefined operator functions that can be overloaded for different data types.