Main entry point[edit] Main article: Entry point As in C, C++, C#, Java, and Go, the entry point to a Kotlin program is a function named "main", which may be passed an array containing any command-line arguments. This is optional since Kotlin 1.3.[26] Perl, PHP, and Unix shell–style string interpolation is supported. Type inference is also supported.

The name is derived from Kotlin Island, a Russian island in the Gulf of Finland, near Saint Petersburg. Andrey Breslav, Kotlin's former lead designer, mentioned that the team decided to name it after an island, in imitation of the Java programming language which shares a name with the Indonesian island of Java

On 7 May 2019, Google announced that the Kotlin programming language had become its preferred language for Android app developers.[7] Since the release of Android Studio 3.0 in October 2017, Kotlin has been included as an alternative to the standard Java compiler.

Prerequisites Basic Kotlin knowledge

This is a collection of excellent Kotlin App Examples. While millions of people have downloaded some of them from Google Play after being produced by prestigious corporations, others are well-liked open-source initiatives that developers find valuable.

construir apps com código parcialmente em Java eparcialmente em Kotlin, sem restrições.

在开发中使用Kotlin有什么奇巧淫技？

Kotlin 语言培训市场规模有多大?

如何评价 Clean Code 作者对 Swift 与 Kotlin 的看法？

如何评价王垠的《Kotlin和Checked Exception》？

Function<*, String> means Function<in Nothing, String>.Function<Int, *> means Function<Int, out Any?>.Function<*, *> means Function<in Nothing, out Any?>.

任何类型，当它被“?”修饰，变成可空类型以后，它就变成原本类型的父类了。所以，从某种程度上讲，我们可以认为“Any？”是所有 Kotlin 类型的根类型

还有助于我们实现函数类型

val parameterAnnotations = method.parameterAnnotations for (i in parameterAnnotations.indices) { for (parameterAnnotation in parameterAnnotations[i]) { // ② if (parameterAnnotation is Field) { val key = parameterAnnotation.value val value = args[i].toString() if (!url.contains("?")) { // ③ url += "?$key=$value" } else { // ④ url += "&$key=$value" } } }

无副作用的函数，它具有引用透明的特性

(::onClick

Preferences DataStore and Proto DataStore DataStore provides two different implementations: Preferences DataStore and Proto DataStore. Preferences DataStore stores and accesses data using keys. This implementation does not require a predefined schema, and it does not provide type safety. Proto DataStore stores data as instances of a custom data type. This implementation requires you to define a schema using protocol buffers, but it provides type safety.

Because it requires less code to do the same thing as other programming languages projects can be developed faster

In this post, we will know the differences between Flutter and Kotlin by considering multiple parameters. Before comparison, we must have an understanding of these technologies.

Programming languages These will probably expose my ignorance pretty nicely.

no one had tried using both Flutter and Kotlin/Native.

They are both trying to extract common parts above platform, but Kotlin Multiplatform is interested in logic extraction when Flutter is interested in view definitions extraction. They concentrate on the opposite, and they might highly benefit from working together

avoid defining the common fields in all the classes

If you mark a declaration private, it will only be visible inside the file containing the declaration;

if you work in multi-threaded environment or otherwise share mutable state between coroutines running in different threads, then you have to use thread-safe (concurrent) data structures.