DEV Community: Max Smirnov

Pocket Kotlin-C# Dictionary. G

Max Smirnov — Thu, 28 Sep 2023 18:10:17 +0000

G

Kotlin	C#
get Property getter. The definition can be omitted for default getter	get Property getter. The definition can be omitted for default getter
@get Annotation target, used to annotate automatically created getters (e.g. when you have a primary constructor, the compiler automatically creates a field, its getter, its setter and so on, an you want to annotate specifically a getter) Learn more	It seems like there's no get: target as of 2023. See an example of unresolved question

Pocket Kotlin-C# Dictionary. F

Max Smirnov — Thu, 28 Sep 2023 17:39:25 +0000

F

Kotlin	C#
false	false
@field Annotation target, used to annotate automatically created fields (e.g. when you have a primary constructor, the compiler automatically creates a field, its getter, its setter and so on, an you want to annotate specifically a field) Learn more	New versions of C# have primary constructors, so there can be a property that is not coded expicitly in the code, but as of 2023 I haven't found a way to attach an attribute to such property See en example of unresolved question
@file Annotation target, used to annotate source file Learn more	In .Net one cannot target attribute on a source file Learn more
final Modifier that forbids overriding of members Learn more	sealed Modifier that forbids overriding of classes and members. In Kotlin classes are final by default, one has to use modifier open to allow inheritance from a class Learn more
finally	finally
for Iterates through anything that implements Iterable<> interface Learn more	foreach Iterates through anything that implements IEnumerable<> interface Learn more
fun Function declaration	C# method declaration doesn't use a designated keyword

Pocket Kotlin-C# Dictionary. E

Max Smirnov — Thu, 28 Sep 2023 11:30:38 +0000

E

Kotlin	C#
else	else See if for differences
enum Modifier for enum classes Learn more	enum In both C# and Kotlin enums are classes, but while in C# it's hidden under the hood, in Kotlin enum is just a modifier for enum class and it has many properties of a casual class: it can have a constructor and methods, it can implement interfaces Learn more
expect Interface-like declaration in cross-platform projects (see actual) Learn more	interface
external Modifier for a function implemented externally, outside of Kotlin (accessible through JNI or in JavaScript). External is undocumented and there is an issue to document it that is unresolved for 8 years as of 2023 Learn more	extern Modifier for an externally implemented method Learn more

Pocket Kotlin-C# Dictionary. D

Max Smirnov — Wed, 27 Sep 2023 16:32:17 +0000

D

Kotlin	C#
data Data class is a class designed to hold data, it has some automatically created methods like value-based equals() and so on Learn more. Data object a singleton with few automatically created methods Learn more	record, which is a synonym for record class, is an equivalent to Kotlin data class. C# doesn't have built-in support for singletons, so the nearest equivalent to the data object is an explicitly coded singleton of record class Learn more
@delegate Annotation target that specifies that annotation is related to delegate automatically created by by Learn more	C# does not have built-in language support for delegation pattern. One can code pattern classes manually and set annotating attributes everywhere he wants
do Do-while loop (loop with postcondition) Learn more	do Do-while loop (loop with postcondition) Learn more
dynamic Turns-off type-checker to to interoperate with untyped or loosely typed environments, such as the JavaScript ecosystem. Not supported in code targeting the JVM Learn more	No such thing. C# code is always statically-typed (types are checked by compiler)

Pocket Kotlin-C# Dictionary. C

Max Smirnov — Tue, 26 Sep 2023 19:26:55 +0000

C

Kotlin	C#
catch Catches exception	catch Catches exception
class Class declaration	class Class declaration
companion object, that is accessible without instantiating a class and Companion, its default name Learn more	Replacement for static properties and methods of a class. Differences are numerous! Learn more
const Compile-time constant Learn more	const Compile-time constant Learn more
constructor Constructor. Can be omitted	C# constructor syntax doesn't use a designated keyword
continue A statement to continue a loop Learn more	continue A statement to continue a loop. Unlike C#, Kotlin has continue@myLabel syntax to continue any level of nested loops. C# doesn't need it because it has goto statement! Hell yeah! Learn more
crossinline Modifier that indicates that lambda parameter of an inline function cannot use non-local returns	In C# there are no non-local returns (lambda cannot execute return from outer method, only from itself), so, technically every method is "crossinline"

Pocket Kotlin-C# Dictionary. B

Max Smirnov — Mon, 25 Sep 2023 17:41:31 +0000

B

Kotlin	C#
break Statement to exit loops Learn more	break Statement to exit loops. C# break is also used to exit switch, while in Kotlin when this is not needed. C# break can exit only inner loop, while Kotlin has break@myLabel syntax to exit loop of any level. Learn more
by Delegation of interface implementation or property getter and setter to another class Learn more and more	This type of delegation has no built-in language support. One has to manually write code that calls delegates

Pocket Kotlin-C# Dictionary. A

Max Smirnov — Fri, 22 Sep 2023 13:07:57 +0000

A

Kotlin	C#
abstract Modifier for classes, properties and functions Learn more	abstract Modifier for classes, methods, properties, indexers, and events Learn more
actual Platform-specific modules feature. Functions, classes, interfaces, enumerations, properties, and annotations can be declared as expect in common module, and actual in platform-specific implementations. As of 2023 expect/ actual feature is in Beta Learn more	Kotlin expect is like an interface, it cannot have an implementation, and actual is like an implementation of interface feature (but it can be an interface itself). Update. See @teneko 's comments below to see how to get the same behavior using partial methods and conditional preprocessor directives.
also() Scope function. Used to avoid if (x == null) construction at any price Learn more	No short equivalent. Can be defined as extention function that takes lambda and returns the object it extends
Anko Kotlin library for Android, deprecated as of 2023 Learn more (etymology: ANdroid + KOtlin)	Xamarin.Forms Xamarin is cross-platform, while Anko is not Learn more
annotation Annotation class defines custom formats for storing metadata Learn more	System.Attribute interface Class that implements System.Attribute interface defines custom attributes, i.e. formats for storing metadata Learn more
Any Root of type hierarchy Learn more	object Root of type hierarchy Learn more
apply() Scope function. Used to avoid if (x == null) construction at any price Learn more	No short equivalent. Can be defined as extention function that takes lambda and returns the object it extends
as Unsafe cast operator, throws an exception when fails Learn more	(T)x type cast Throws an exception when fails Learn more
as? Safe cast operator, returns null if fails to cast Learn more	as Returns null if fails to cast Learn more

Pocket Kotlin-C# Dictionary

Max Smirnov — Fri, 22 Sep 2023 11:04:12 +0000

Hi!
My name is Max, and I'm studying Kotlin. I have more than 20 years of experience in other programming languages, so for me learning another language is more like learning new names of concepts I'm already familiar with.
For my own purposes I want to build a kind of dictionary, translations of Kotlin keywords to my mother tongue C# :), and I'd like to share it with everyone. I want it to be somewhat similar to conventional human language dictionaries - just for fun.
So, here comes a series of posts, each covering some letter, from A to @. I hope it will be useful for people learning Kotlin!