Mobile App Development 3

Question 1

functions

Answer 1

• building blocks of readable, maintainable, and reusable code
• statements to perform a specific task
• organize the program into logical
  blocks of code

Question 2

function definition specifies what and how a specific task would be done

Answer 2

defining a function

Question 3

a function must be called sa as to execute it

Answer 3

calling a function

Question 4

functions may return value along with control, back to the caller

Answer 4

returning a function

Question 5

paremeters are a mechanism to pass values to functions

Answer 5

parameterized function

Question 6

functions and descriptions

Answer 6

1. defining a function
2. calling a function
3. returning a function
4. parameterized function

Question 7

• can be used when arguments need not be compulsorily passed for a function’s execution.
• A parameter can be marked optional by appending a question mark to its name.

Answer 7

Optional Parameters

Question 8

three types of optional parameters in Dart

Answer 8

1. optional positional paramaters
2. optional named parameters
3. optional parameters with default values

Question 9

to specify this paramater, use bracket[]

Answer 9

optional positional parameter

Question 10

• parameter’s name must be specified while name value is passed
• {} can be used to specify

Answer 10

optional named parameters

Question 11

• values can also be defined by default
• parameters can be explicitly passed values

Answer 11

optional parameter with default value

Question 12

• technique for iterating over an operation by having a function call to itself
  repeatedly until it arrives at a result
• best applied when you need to call the
  same function repeatedly with different parameters from within a loop.

Answer 12

recursion

Question 13

Lambda

Answer 13

• concise mechanism to represent function
• also called as arrow functions

Question 14

A class definition can include the following

Answer 14

1. field
2. setter and getter
3. constructor
4. function

Question 15

• s any variable declared in a class.
• represent data pertaining to
  objects

Answer 15

field

Question 16

• Allows the program to initialize and retrieve the values of the fields of a class
• associated with every class

Answer 16

setter and getter

Question 17

responsible for allocating memory for the objects of the class

Answer 17

constructor

Question 18

• represent actions an object can take
• also known as method

Answer 18

function

Question 19

components put together are termed

Answer 19

data members

Question 20

• to create instance, what keyword should be used that is followed by class name
• responsible for instantiation

Answer 20

new

Question 21

The right-hand side of the expression invokes the constructor (True or False)

Answer 21

True

Question 22

The constructor should be passed values if it is parameterized (true or flase)

Answer 22

true

Question 23

what can you access through the object

Answer 23

attribute and functions

Question 24

if you do not declare a constructor, this is provided for you

Answer 24

no argument constructor

Question 25

Does dart provides named constructors to enable a class define multiple constructors

Yes or No

Answer 25

Yes

Question 26

allow the program to initialize and retrieve the values of class fields respectively

Answer 26

Getters and Setters

Question 27

• A class inherits from another class using the ‘extends’ keyword
• Child classes inherit all properties and methods except constructors from the parent class

Answer 27

Class Inheritance

Question 28

Types of Inheritance

Answer 28

1. single
2. multiple
3. multi-level

Question 29

class can at the most extend from one parent class.

Answer 29

Single

Question 30

A class can inherit from multiple classes. Dart doesn’t support multiple
inheritance

Answer 30

Multiple

Question 31

class can inherit from another child class

Answer 31

Multi-level

Question 32

defines the datatype in which output is going to come.

Answer 32

return type

Question 33

there are four types of functions in Dart

Answer 33

1. no parameter and no return type
2. parameter and no return type
3. no parameter and return type
4. parameter and return type