Upcasting class
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Taking an object reference and treating it as a reference to its base type is called upcasting.
#kotlin
62 posts · page 4 of 8
Abstract or Interface
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An abstract class is like an ordinary class except one or more functions or properties is incomplete - ie. a function without implementation or a property without initialisation.
Ask for inheritance
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Inheritance is a mechanism for creating a new class by reusing and modifying an existing class.
Primary Constructor vs Secondary Constructor
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A constructor is a special function that creates a new object. Using var or val in the parameter list makes them accessible from outside the object.
Making recursion more efficient with tailrec
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Recursion is the programming technique of calling the function within the same function. A recursive function uses the result from the previous recursive call. The perfect example for recursion is fi…
Elegant Local Function
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What exactly is local function? It was new to me in Kotlin and thought it is interesting to dig deeper. In a normal class, we have many functions within a class - the functions have names so that we…
Folding and Reducing List
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fold() combines all elements of a list, in order to generate a single result. Here is how we can use fold() to calculate the sum -
Sequence: lazy evaluation
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What is Sequence? A Kotlin Sequence is like a List, but you can only iterate. You cannot index into Sequence. And this restriction produces very efficient chained operations.