Kotlin Arrays

FAQ

Q. What should be the datatype of elements stored in an array?
A. In Kotlin you can store multiple datatypes into an array, so it can be any type of element.

Q. How to find if an item is present in an array or not?
A. We can use the contains function to check if an item is present or not. It return true/false.

Q. What is the output of indexOf function?
A. indexOf function as defined by the name returns the index of the element that the user search for and return -1 if element is not present in array.

Q. Can we construct an array that can auto assign values of elements corrosponding to its index?
A. Yes, we can do that by using Array function i.e. val arr = Array(size, {x -> x * x}), so this will initialize the values as squares of the index, this function can be defined as per the requirement.

MCQ

Q. What is the syntax to declare and assign values to an array?
a) val arr = {1, 2, 3, 4, 5}
b) val arr = ArrayOf(1, 2, 3, 4, 5)
c) val arr = arrayOf(1, 2, 3, 4, 5)
d) val arr = Array(1, 2, 3, 4, 5)

A. c) val arr = arrayOf(1, 2, 3, 4, 5)

Q. How to find the number of elements in an array arr?
a) arr.length
b) arr.size
c) arr.length()
d) arr.size()

A. b) arr.size

Q. The elements of this array are : val arr = Array(5, {x -> x * x})
a) (0, 1, 2, 3, 4)
b) (1, 2, 3, 4, 5)
c) (0, 1, 4, 9, 16)
d) (1, 4, 9, 16, 25)

A. C) (0, 1, 4, 9, 16)

Q. How to create a new array using the elements from a given array arr containing values (5, 10, 15, 20, 25, 30, 35, 40, 45, 50) that has the values (10, 15, 20, 25)?
a) var ans = copyOfRange(arr{2, 5})
b) var ans = arr.copyOfRange(2, 6)
c) var ans = arr.copyOfRange(1, 5)
d) var ans = arr.copyOfRange(1, 4)

A. c) var ans = arr.copyOfRange(1, 5)