Posts (page 28)
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7 min readTo extract multiple day and time from a string in Kotlin, you can use regular expressions to match the desired patterns. First, create a regular expression pattern that captures the day and time format you are looking for in the string. Then, use the find() method from the Regex class to search for all occurrences of the pattern in the string. Iterate through the matched results and extract the day and time information from each match.
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4 min readIn Kotlin, you can set a custom return type as nullable by appending a question mark (?) after the type declaration. This indicates that the return type can either be of the specified type or null.For example, if you have a function that returns a String and you want to make the return type nullable, you can declare the function like this:fun exampleFunction(): String? { return "Hello" }In this case, the return type of the function exampleFunction is a nullable String.
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3 min readTo add a month or day to a current or chosen date in Kotlin, you can use the Calendar class and its functions. First, create a Calendar instance and set it to the current or chosen date. Then, use the add() method to add the desired amount of months or days to the date. Finally, retrieve the updated date using the getTime() method. This allows you to easily manipulate dates in Kotlin by adding months or days to them.
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3 min readTo remove a specific string from a list of strings in Kotlin, you can use the filter() method along with the notEquals operator to create a new list that does not contain the desired string. Here's an example code snippet:val listOfStrings = listOf("apple", "banana", "orange", "grape") val stringToRemove = "orange"val filteredList = listOfStrings.filter { it .
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4 min readIn Kotlin, you can override a method from a superclass in a subclass by using the override keyword before the method declaration in the subclass. This allows you to provide a different implementation for the method in the subclass, while still maintaining the same method signature as the superclass.When you override a method in a subclass, you can call the superclass implementation using the super keyword.
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2 min readThe largest array/collection in Kotlin is probably the ArrayList class, which is a resizable implementation of the List interface. This class allows for dynamic resizing of the collection, making it suitable for scenarios where the size of the collection may grow or shrink during runtime. ArrayLists are commonly used in Kotlin for storing and manipulating large amounts of data efficiently.[rating:a758298c-4a13-4637-82df-0735f79a496a]What is the use of collections.emptyList() function in Kotlin.
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5 min readIn Kotlin, you can pass parameters to an extension function just like you would pass parameters to a regular function. When declaring the extension function, simply include the parameter(s) in the parentheses after the function name.For example, if you have an extension function called "printFormatted" for the String class that takes a delimiter parameter, you can define it like this:fun String.printFormatted(delimiter: String) { val parts = this.split(" ") println(parts.
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5 min readIn Kotlin, you can call the super method in a listener by using the "super" keyword followed by the method name. For example, if you are overriding the onClick method of a View.OnClickListener in a subclass, you can call the super method like this: override fun onClick(view: View) { super.
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5 min readTo count the number of threads created in Kotlin, you can use the Thread.activeCount() method provided by the Java API. This method returns an estimate of the number of active threads in the current thread's thread group. You can call this method in your Kotlin code to get the total number of threads created in your application at runtime.
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4 min readTo reformat a list of items from Lua to Kotlin, you can create a new list in Kotlin and iterate through each item in the Lua list, adding them to the new Kotlin list. You will need to convert each item from Lua data type to Kotlin data type as needed. Also, make sure to handle any differences in syntax or data structures between Lua and Kotlin.[rating:a758298c-4a13-4637-82df-0735f79a496a]What options do I have for automating the reformatting of lists in Kotlin.
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4 min readIn Kotlin, you can create a custom data type by using the "class" keyword followed by the name of your data type. Within the class, you can define properties and functions specific to your custom data type.You can also define constructors within the class to initialize the properties of your data type. Additionally, you can create companion objects within the class to define static functions or properties.
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5 min readTo store a class in a variable in Kotlin, you can use the ::class.java syntax. This allows you to reference the class as an object. For example, you can store the String class in a variable like this: val myClass = String::class.java This way, you can use the myClass variable to refer to the String class throughout your code. This can be useful when you need to dynamically create instances of a class or pass it as a parameter to a function.