Swift Kotlin Grammar Tests

Which of the following syntaxes is correct for creating a constant in Swift?

• let constantName = "Value"

• const constantName = "Value"

• var constantName = "Value"

• constant constantName = "Value"

How to declare an immutable variable in Kotlin?

• const val variableName = "Value"

• let variableName = "Value"

• var variableName = "Value"

• val variableName = "Value"

Which operator is used to check for null values in Kotlin?

• == null

• === null

• ?.

• !!

What is the result of executing the expression "Hello".count() in Swift?

• Compilation error

• 5

• 6

• "Hello"

How to create a method in a class in Kotlin?

• fun methodName() {}

• method methodName() {}

• def methodName() {}

• function methodName() {}

Which of the following syntaxes in Swift is used to declare an optional type?

• var name: String?

• var name: Optional(String)

• var name: String!

• var name: Optional<String>

What does the !! operator mean in Kotlin?

• Converts a nullable type to a non-nullable type, throwing an exception if null

• Returns null

• Checks the value for null

• Sets a default value

What is the syntax for performing a loop in Swift?

• for (var i = 0; i < 10; i++) {}

• for i in 0..<10 {}

• while (i < 10) {}

• loop i from 0 to 10 {}

Which keyword is used to create an interface in Kotlin?

• interface

• implements

• abstract

• class

How to create an anonymous function in Swift?

• function(parameters): ReturnType { code }

• lambda(parameters): ReturnType { code }

• fun(parameters): ReturnType { code }

• { (parameters) -> ReturnType in code }