Android Development with Kotlin

Vararg parameter

Sometimes, the number of parameters is not known in advance. In such cases, we can add a vararg modifier to a parameter. It allows the function to accept any number of arguments. Here is an example, where the function is printing the sum of multiple integers:

    fun printSum(vararg numbers: Int) { 
        val sum = numbers.sum() 
        print(sum) 
    } 
 
    printSum(1,2,3,4,5) // Prints: 15 
    printSum()          // Prints: 0 

Arguments will be accessible inside the method as an array that holds all the provided values. The type of the array will correspond to a vararg parameter type. Normally we would expect it to be a generic array holding a specified type (Array<T>), but as we know, Kotlin has an optimized type for arrays of Int called IntArray, so this type ...