Swift Test

What is the name of the Xcode generated header file used to import Swift classes into an Objective-C Class given a product module named Example?

EXAMPLESWIFT.H

EXAMPLE.SWIFT.H

EXAMPLE+SWIFT.H

EXAMPLE-SWIFT.H

What does a retainCount represent in ARC?

THE CURRENT NUMBER OF STRONG REFERENCES TO AN OBJECT.

THE CURRENT NUMBER OF INSTANCES OF AN OBJECT.

THE TOTAL NUMBER OF OBJECTS CURRENTLY BEING RETAINED IN MEMORY.

THE TOTAL NUMBER OF TIMES AN OBJECT HAS BEEN ALLOCATED.

Which of the following statements is a valid way to extend the capabilities of our theoretical class, MyClass to conform to protocol MyProtocol?

EXTENSION MYCLASS(MYPROTOCOL) { }

EXTENSION MYCLASS, PROT MYPROTOCOL { }

EXTENSION MYCLASS: MYPROTOCOL { }

EXTENSION MYCLASS, MYPROTOCOL { }

Which one is the correct keyword for defining a constant in Swift? ( or To declare a constant in Swift you would use: )

CONST

CONTANT

FINAL

LET

What is the name of the Swift language feature that Objective-C Blocks are translated into?

LAMBDA

CALLBACK

CLOSURE

SELECTOR

What is the name of the deinitializer in a Class declaration?

DEINIT

DEALLOC

RELEASE

ROOT

All Swift classes must inherit from which root class?

SWIFT CLASSES DO NOT REQUIRE A ROOT CLASS.

NSOBJECT

@OBJC

ROOT

Which keyword is used on a function in an enumeration to indicate that the function will modify 'self'?

MODIFIER

MUTATING

MUTABLE

MOD

Which keyword is used on a function inside an Enumeration to indicate that the function will modify 'self'?

MODIFIER

MUTATING

MUTABLE

MOD

Which of the following statements could be used to determine if a given variable is of String type?

IF STRING.HIERARCHY(UNKNOWNVARIABLE) { }

IF UNKNOWNVARIABLE IS STRING { }

IF UNKOWNVARIABLE: STRING { }

IF (STRING)UNKNOWNVARIABLE { }

What type of object are Swift Structures?

REFERENCE TYPE

MEMORY TYPE

ABSTRACT TYPE

VALUE TYPE

Which of the following declares a mutable array in Swift?

VAR X = [INT]

LET X = [INT]

VAR X = [INT]()

LET X = [INT]()

Which keyword is used in Swift when we want a property of a class to initialize when it is accessed for the first time?

LET

VAR

CONST

LAZY

Which is used for down casting?

Note: Select more than 1 option as correct answer

AS!

IS

IS?

AS?

Which of the following types can be used use as raw value types for an enumeration?

BOOL

ARRAY

INT, STRING, FLOAT

DICTIONARY

Which keyword do you use to declare enumeration?

VAR

ENUM

STRUCT

CASE

When declaring an enumeration, multiple member values can appear on a single line, separated by which punctuation mark?

SEMI-COLON

COLON

COMMA

SLASH

How do closures capture references to variables by default?

BY WEAK REFERENCE

BY STRONG REFERENCE

BY UNOWNED REFERENCE

BY COPY

Which of the folowing could be used to indicate the Function Type of the folowing function: func joinStrings(stringOne: String, stringTwo: String) -> String { return stringOne + stringTwo }

FUNC(STRING, STRING -> STRING)

(STRING, STRING) -> STRING

{STRING, STRING} -> STRING

{STRING, STRING}(STRING)

What is used in Swift to represent any kind of object?

OB

ID

ANYOBJECT

NOTHING

What is the name of the Objective-C Bridging Header given a product module named Example?

EXAMPLE-BRIDGING-SWIFT.H

EXAMPLE-SWIFT.H

EXAMPLE-BRIDGING-OBJECTIVEC.H

EXAMPLE-BRIDGING-HEADER.H

What is the type name that represents a character in Swift?

CHARACTER

CHAR

STRING

NSSTRING

What is a muting instance method in Swift?

WHEN THERE IS "MUTING" KEYWORD IN FRONT OF EXTENSION.

WHEN EXTENSION CAN ADD NEW TYPES TO EXISTING CLASSES.

WHEN INSTANCE METHOD WITHOUT EXTENSION CAN MODIFY ITSELF.

A METHOD THAT MODIFIES SELF.

Swift Extensions are similar to categories in Objective-C except:

SWIFT EXTENSION MIGHT HAVE A SPECIFIC NAME

SWIFT EXTENSION DOESN’T FUNCTIONALITY TO PREVIOUSLY DEFINED TYPE.

SWIFT CAN OVERRIDE METHOD FROM ORIGINAL TYPE.

SWIFT EXTENSIONS ARE NOT NAMED.

How could one declare a Swift Array type that can store any type of class object?

VAR ARR: [ID] = [ ]

VAR ARR: [ANYOBJECT] = [ ]

[ANYOBJECT] ARR = [ ]

VAR ARR = NSARRAY()

What set of keywords is most commonly used to iterate over a collections of items?

FOR EACH

SWITCH CASE

DO WHILE

FOR IN

How can we use optional binding to determine if the variable string is not nil?

IF LET STR = STRING {…}

IF STRING {…}

IF STRING AS STRING {…}

IF LET STRING {…}

What is a trailing closure?

A CLOSURE EXPRESSION THAT IS CALLED DIRECTLY AFTER ANOTHER CLOSURE EXPRESSION

A CLOSURE EXPRESSION THAT IS WRITTEN OUTSIDE OF (AND AFTER) THE PARENTHESES OF THE FUNCTION CALL IT SUPPORTS.

A CLOSURE EXPRESSION THAT IS DECLARED WITHIN THE SCOPE OF ANOTHER CLOSURE EXPRESSION.

A CLOSURE EXPRESSION THAT IS DECLARED AT THE PROPERTY OF AN OBJECT.

Which of the following statements is true regarding Swift closures and functions?

FUNCTIONS AND CLOSURES ARE NOT RELATED

A FUNCTION IS A CLOSURE DECLARED WITHIN THE SCOPE OF A CLASS

A FUNCTION IS A NAMED CLOSURE

CLOSURES CAN’T BE USED AS ARGUMENTS, FUNCTIONS CAN

What are the available arithmetic overflow operators in Swift?

OP+,OP-,OP*,OP/,OP%

&+,&-,&*,&/,&%

+,-,*,/,%

&, |, &&, ||

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Exam Type:	Swift MCQ Skill Test
Questions Type:	Multiple Choice Questions
Total Questions:	30
Time Limit:	30 Minutes
Last Update	July, 2025

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