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What is Kotlin?
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What is Kotlin?
last updated: 29 January 2025
Kotlin
is a language that is concise, secure, seamlessly compatible with
Java
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Why is IntelliJ IDEA the most popular development environment for Kotlin?
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Объявления
Объявления
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What is Kotlin?
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Why is IntelliJ IDEA the most popular development environment for Kotlin?
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Download and install IntelliJ IDEA to explore Kotlin
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Create a new project in IntelliJ IDEA for study Kotlin
Int, Float, Boolean, Char ...
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Integer numbers in Kotlin are: Byte, UByte, Short, UShort, Int, UInt, Long, ULong
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Decimal numbers in Kotlin are: Float, Double
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A flag with values of true or false in Kotlin is: Boolean
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The symbol in Kotlin is: Char
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Convert number to text in Kotlin | Int → String
String
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The string, the text in Kotlin is: String
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Interpolate strings in Kotlin. Example: val address:String = "${street}, ${country}"
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What is the difference between String and StringBuilder ?
Enum
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What is an enumeration (enum) in Kotlin ?
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How do I find enum by value in Kotlin ?
Class
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What is class in Kotlin? Example: class MyBook { ... }
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lateinit is a late initialization for the class field | Kotlin
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class that inherits from interface in Kotlin | Example: class MyBook : IBook { ...}
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Unnamed class that inherits from interface in Kotlin | Example: val book1 = object : IBook { ...}
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Generic, template class in Kotlin | Example: class MyBook<T> { ... }
Collections and Arrays
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Create collections list, set, map and an array array in Kotlin
null
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null value, use the symbol ? and ?. and !! and ?: and !!. and ?. in Kotlin
Lambda function
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Lambda function in Kotlin. Example 1: var myFunc1 : (a:Int, b:Int) -> Int = { p1, p2 -> p1 + p2 };
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