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Collection Filtering in Kotlin

Most often than not, when dealing with collections there’s a need for filtering them before displaying.

Easy Singletons in Kotlin

Singleton pattern involves a single class which is responsible to create an object while making sure that only one single instance gets created.

Multiline String Literals in Kotlin

Multiline String Literals in Java have always been clumsy and full of + operators for line-breaks.

Named Arguments in Kotlin

Using named arguments you can make more expressive calls.

Group Initialisation in Kotlin

Group object initialisation in Kotlin promote cleaner and easier to read code.

Destructuring Declarations in Kotlin

A destructuring declaration creates multiple variables at once.

Local functions in Kotlin

Kotlin supports local functions, i.e. it allows you to put a function inside a function.

Tail recursive functions in Kotlin

Algorithms that would normally be written using loops are instead written as recursive functions with no risk of stack overflows.

Flattening Lists and Arrays in Kotlin

With the flatten method in Kotlin, you can turn a list of lists and array of arrays into a single list of all elements.

Checking for nulls in Kotlin

Kotlin’s type system is aimed to eliminate NullPointerException's from your code.

Vetoable properties in Kotlin

Vetoable are delegate properties that allow you to update a property value if a certain condition is matched.

Functions With Expression Body

When a function returns a single expression, the curly braces can be omitted and the body is specified after a = symbol.

Working With Ranges in Kotlin

Kotlin provides a simple and intuitive way to create ranges.

Functions are first-class citizens in Kotlin

Kotlin functions are first-class citizens, which means they can be stored in variables and data structures, passed as arguments to and returned from other functions

Extension functions in Kotlin

In most programming languages you have to derive a new class. In Kotlin you can extend a class with new functionality.

Lazy initialisation in Kotlin

Just like Late Initialisation lazy lets you initialise a property only when you need it, but it also remembers its value for future calls.