Kotlin Tutorial – Learn to program with simple examples

Single-line functions (also known as one-expression functions) in Kotlin are functions that consist of only one expression and are defined without curly brackets {}. They help improve the readability and compactness of the code, especially for simple and short functions. The syntax of a Single Expression Function in Kotlin has the following structure: fun – The keyword to define a function. functionName – The name of the function.

In Kotlin there are local functions that can be defined within a larger function. These functions are only visible within this larger function and cannot be accessed from outside. Local functions have the advantage of making code more readable and clear by packaging complex subtasks within a larger function. This can also help avoid code duplication and increase code maintainability

The signature of a function in programming represents a kind of unique identifier of a function. By using the function signature, for example, a function in a group of functions with the same name can be uniquely identified and called. The function signature in Kotlin always consists of the name of the function as well as its parameter list, including the number, types and order of parameters, as well as the return type. The following example illustrates this

In Kotlin, every entity is represented as an object, including functions. Therefore, like all other objects, functions also have a specific type. The function type describes the number and type of parameters a function takes and the type of value it returns, without mentioning the function name. Function types allow functions to be used as values ​​and stored in variables as arguments to other functions

Kotlin has the ability to treat functions as values ​​and store them in variables. There are two basic approaches: assignment using a lambda expression or using a function reference. This is useful when you want to pass functions as arguments to other functions or change them dynamically at runtime. Assignment using a lambda expression We will deal with the topic in another chapter

In Kotlin, higher-order functions are those functions that accept other functions as parameters or return functions as a result. They are an important part of functional programming and offer greater flexibility and abstraction when developing programs. Below are some examples of higher order functions in Kotlin. Example 1: Function as a parameter In this example, a function called calculation is defined, which has two

In Kotlin, anonymous functions are functions that do not have explicit names and can be defined directly as expressions in another function or expression. They are often used as an alternative way to write lambda expressions and can also be passed as arguments to other functions. Here is an example of an anonymous function in Kotlin: This example defines an anonymous function that

In Kotlin there is a function called Lambda, which is also called an anonymous function. A Lambda function is a short and simple way to define a function without an explicit name. A lambda function is written in parentheses and has a single expression that is used as the return value. Here is a simple example of a lambda function in Kotlin: A lambda expression can be saved into a normal variable and then

There are several standard functions in Kotlin that are designed to solve common tasks more efficiently and easily. These functions are part of the Kotlin standard library and can be used directly in code. In the following chapters, we will look at commonly used standard functions for working with strings, mathematical operations, arrays, collections, and date and time. For each function, the syntax and working method are explained as well as common ones

Kotlin provides a standard set of functions for mathematical operations. These are stored in a separate package called 'kotlin.math' and are only imported into the code of an application when necessary. Importing functions that are not available by default in a language is common in many programming languages ​​to reduce the size of the generated program and possible naming conflicts. To load mathematical functions from the kotlin.math library