Generic function declaration in Kotlin - Mini Project: Build & Apply

Generic Function Declaration in Kotlin

📖 Scenario: Imagine you want to create a simple function that can work with different types of data, like numbers or words, without writing separate functions for each type.

🎯 Goal: You will build a generic function in Kotlin that takes one input and returns it unchanged. This helps you understand how to write functions that work with any type.

📋 What You'll Learn

Create a generic function called identity with a type parameter T

The function should take one parameter named value of type T

The function should return the same value without changes

Call the identity function with an Int and a String

Print the results of both calls

💡 Why This Matters

🌍 Real World

Generic functions let you write flexible code that works with many data types, saving time and avoiding repetition.

💼 Career

Understanding generics is important for Kotlin developers to build reusable libraries and clean code.

1

Create a generic function declaration

Write a generic function called identity with a type parameter T that takes one parameter named value of type T and returns value.

Kotlin

# Your code here
// Define the generic function identity(value: T): T

Need a hint?

Use fun <T> identity(value: T): T to declare a generic function.

2

Call the generic function with an Int

Call the identity function with the integer 42 and store the result in a variable called intResult.

Kotlin

fun  identity(value: T): T {
    return value
}

// Call identity with 42 and store in intResult
# Your code here

Need a hint?

Use val intResult = identity(42) to call the function with an Int.

3

Call the generic function with a String

Call the identity function with the string "Hello" and store the result in a variable called stringResult.

Kotlin

fun  identity(value: T): T {
    return value
}

val intResult = identity(42)

// Call identity with "Hello" and store in stringResult
# Your code here

Need a hint?

Use val stringResult = identity("Hello") to call the function with a String.

4

Print the results

Print the values of intResult and stringResult using two separate println statements.

Kotlin

fun  identity(value: T): T {
    return value
}

val intResult = identity(42)
val stringResult = identity("Hello")

// Print intResult and stringResult
# Your code here

Need a hint?

Use println(intResult) and println(stringResult) to show the results.