kotlin keywords

Question 1

as

Answer 1

• is used for type casts.

- specifies an alias for an import.

Question 2

as?

Answer 2

is used for safe type casts.

Question 3

break

Answer 3

terminates the execution of a loop.

Question 4

class

Answer 4

declares a class.

Question 5

continue

Answer 5

proceeds to the next step of the nearest enclosing loop.

Question 6

do

Answer 6

begins a do/while loop (loop with postcondition).

Question 7

else

Answer 7

defines the branch of an ‘if expression’ which is executed when the condition is false.

Question 8

false

Answer 8

specifies the ‘false value’ of the Boolean type.

Question 9

for

Answer 9

begins a “for loop”.

Question 10

fun

Answer 10

declares a function.

Question 11

if

Answer 11

begins an “if expression”.

Question 12

in

Answer 12

• specifies the object being iterated in a ‘for loop’.
• is used as an infix operator to check that a value belongs to ‘a range’, a collection or another entity that defines the ‘contains method.’
• is used in ‘when expressions’ for the same purpose.
• marks a type parameter as ‘contravariant’.

Question 13

!in

Answer 13

• is used as an operator to check that a value does NOT belong to ‘a range’ , a collection or another entity that ‘defines the ‘contains method’.

is used in ‘when expressions’ for the same purpose.

Question 14

interface

Answer 14

declares an ‘interface’ .

Question 15

is

Answer 15

• checks that ‘a value does NOT have a certain type’ .

- is used in ‘when expressions’ for the same purpose.

Question 16

null

Answer 16

is a constant representing an object reference that does not point to any object.

Question 17

object

Answer 17

declares ‘a class and its instance at the same time.

Question 18

package

Answer 18

specifies the ‘package for the current file’ .

Question 19

return

Answer 19

‘returns from the nearest enclosing function or anonymous function’ .

Question 20

super

Answer 20

• ‘refers to the superclass implementation of a method or property’ .
• ‘calls the superclass constructor from a secondary constructor’ .

Question 21

this

Answer 21

• refers to the ‘current receiver’ .

- ‘calls another constructor of the same class from a secondary constructor’ .

Question 22

throw

Answer 22

‘throws an exception’ .

Question 23

true

Answer 23

specifies the ‘true’ value of the ‘Boolean Type’ .

Question 24

try

Answer 24

‘begins an exception handling block’ .

Question 25

typealias

Answer 25

declares ‘a type alias’ .

Question 26

typeof

Answer 26

reserved for future use.

Question 27

val

Answer 27

declares a read-only ‘property’ or ‘local variable’ .

Question 28

var

Answer 28

declares a mutable ‘property’ or ‘local variable’ .

Question 29

when

Answer 29

begins a ‘when expression’ (executes on of the given branches).

Question 30

while

Answer 30

begins a ‘while loop’ (loop with precondition).