Kotlin

In a previous post I had gone over how a “Try” type can be created in Kotlin from scratch to handle exceptions in a functional way. There is no need however to create such a type in Kotlin, a type called “Result” already handles the behavior of “Try” and this post will go over how it works. I will be ...

In this post we will learn how we can use Kotlin extension functions to provide a simple and elegant type conversion mechanism. Maybe you have used Apache Sling before. In this case, you are probably familiar with Slings usage of adapters. We will implement a very similar approach in Kotlin. Creating an extension function With Kotlins extension functions we can ...

Functional programming languages like Scala often have a type called “Try” to hold the result of a computation if successful or to capture an exception on failure.  This is an incredibly useful type, allowing a caller to pointedly control how to handle an exceptional scenario. In this post I will try and create such a type from scratch. As an example, ...

Dependency injection is a common technique in today’s software design. With dependency injection we pass dependencies to a component instead of creating it inside the component. This way we can separate construction and use of dependencies. In this post we will look at Koin, a lightweight Kotlin dependency injection library. Koin describes itself as a DSL, a light container and ...

Jackson Kotlin module library is a pleasure to use. It greatly simplifies gnarly code, specifically one’s involvingTypeReference.  Consider a sample json which looks like this: 1 2 3 4 5 {     "a" : ["b", "c"],     "b" : ["a", "c"],     "c" : ["a", "b"] } This content can be represented as a “Map<List<String>>” type in Java.  So now, if I were ...

If you ever need to capture the smallest or largest “n” from a stream of data, the approach more often than not will be to use a simple data-structure called the Priority Queue.  Priority Queues do one thing very well – once a bunch of data is added, it can return the lowest value (or the highest value) in constant ...

1. Overview In this tutorial, We’ll learn how to convert the List to Map in Kotlin programming. Let us explore the different ways to do it. 1. Overview In this tutorial, We’ll learn how to convert the List to Map in Kotlin programming. Let us explore the different ways to do this conversion. Kotlin provides a set of methods for ...

1. Overview In this tutorial, We will learn how to convert the String value to Float in Kotlin. This conversion is done using toFloat() method of String class. But there are many cases where it gives parsing errors for wrong inputs. 2. Kotlin String to Float using toFloat() Method Converting string to float is done with toFloat() method of string ...

1. Overview In this tutorial, We will learn how to create the variables in Koltin for basic types using var. var is a keyword in kotlin which is used todeclare the any type of variable. Kotlin has another keyword ” val” to declare the variables. Any variable is declared using var that value can be changed at anytime whereas variable ...