Mobile App Development 2

Question 1

open-source general-purpose programming language. It is originally developed by Google and later approved as a standard by ECMA.

Answer 1

Dart

Question 2

a new programming language
meant for the server as well as the browser

Answer 2

Dart

Question 3

a transpiler that generates
JavaScript equivalent of a Dart Script

Answer 3

-dart2js

Question 4

introduced by google, the dart sdk ship with its dart compiler?

Answer 4

Dart VM

Question 5

what is dart

Answer 5

object-oriented language with C-style syntax which can optionally trans compile into JavaScript.

Question 6

dart supports a varied range of programming aids like

Answer 6

1. interfaces
2. classes
3. collections
4. generics
5. optional typing

Question 7

Dart can be extensively used to

Answer 7

single-page application

Question 8

what is single-page application

Answer 8

• enable navigation between different screens of the website without loading a different webpage in the browser
• Gmail

Question 9

main() function

Answer 9

• predefined method
  entry point of application

Question 10

print()

Answer 10

predefined method that prints specified string or value

Question 11

Dart Command-Line Options

Answer 11

1. -c
2. -h
3. -p < path>
4. –packages < path>
5. –version

Question 12

enables both assertions and type checks

Answer 12

-c

Question 13

-h

Answer 13

displays help

Question 14

–version

Answer 14

shows file version VM information

Question 15

–packages < path >

Answer 15

path package resolution configuration file

Question 16

-p < path>

Answer 16

where to find imported libraries

Question 17

names given to elements in a program like variables,
functions

Answer 17

Identifiers

Question 18

The rules for identifiers are

Answer 18

1. not inslude special symbols except underscre and dollar sign
2. unique
3. identifers cannot be keywords
4. identifiers are case-sensitive
5. cannot contain spaces

Question 19

object orientation

Answer 19

• software development paradigm that follows real-world modelling
• considers a program as a collection of objects that communicate with each other via mechanism called methods.

Question 20

a real-time representation of any entity

Answer 20

Object

Question 21

Grady Brooch,
every object must have three features

Answer 21

1. state
2. behavior
3. identity

Question 22

State

Answer 22

− described by the attributes of an object

Question 23

Behavior

Answer 23

− describes how the object will act

Question 24

identity

Answer 24

a unique value that distinguishes an object from a set of similar such
objects

Question 25

class

Answer 25

* A class in terms of OOP is a blueprint for creating objects. * A class encapsulates data for the object

Question 26

method

Answer 26

facilitate communication between objects

Question 27

Dart language supports the following types

Answer 27

1. number 2. string 3. boolean 4. list 5. maps

Question 28

are used to represent numeric literals.

Answer 28

numbers

Question 29

two types off numbers

Answer 29

1. integer 2. double

Question 30

* represent non-fractional values, i.e., numeric values without a decimal point. * Integer literals are represented using the intkeyword

Answer 30

integer

Question 31

* supports fractional numeric values i.e. values with decimal points. * The Double data type in Dart represents a 64-bit (double-precision) floating-point number.

Answer 31

double

Question 32

string

Answer 32

* represent a sequence of characters. For instance, if you were to store some data like name, address etc. the string data type should be used * used to represent string literals. String values are embedded in either single or double quotes

Question 33

sequence of UTF-16 code units

Answer 33

dart string

Question 34

sequence of UTF-32 code units

Answer 34

Runes

Question 35

boolean

Answer 35

data type represents Boolean values true and false

Question 36

list and map

Answer 36

are used to represent a collection of objects

Question 37

list

Answer 37

* ordered group of objects * synonymous to the concept of an array in other programming languages

Question 38

map

Answer 38

data type represents a set of values as key-value pairs

Question 39

dart core

Answer 39

enables creation and manipulation of these collections through the predefined List and Map classes respectively.

Question 40

dynamic

Answer 40

* type of a variable is not explicitly * specified used as a type annotation explicitly

Question 41

variable

Answer 41

* “a named space in the memory” that stores values. * In other words, it acts a container for values in a program. * Variable names are called identifiers.

Question 42

keyword are used to declare constants

Answer 42

final and const

Question 43

const

Answer 43

* compile time constant * declared are implicitly final

Question 44

List Properties

Answer 44

1. first 2. last 3. isEmpty 4. isNotEmpty 5. length 6. reversed 7. single

Question 45

first

Answer 45

returns first element in list

Question 46

isEmpty

Answer 46

returns true if collection has no element

Question 47

isNotEmpty

Answer 47

returns true if collection has at least one element

Question 48

length

Answer 48

returns size of the list

Question 49

reversed

Answer 49

returns an iterable object containing list values in reversed order

Question 50

single

Answer 50

checks if list has only one element and returns it

Question 51

Lists (Basic Operations)

Answer 51

1. List.add() 2. Update the index, List.replaceRange() 3. following functions supported in dart:core library can be used to remove in list

Question 52

List.add()

Answer 52

function depends in the specified value to the end of the List and returns a modified List object

Question 53

Map

Answer 53

* simple key or value par * dynamic collection * shrink or grow at runtime

Question 54

Maps can be declared in two ways

Answer 54

* using map literals * using map constructors

Question 55

Declaring a Map using Map Literals

Answer 55

* To declare a map using map literals, you need to enclose the key-value pairs within a pair of curly brackets "{ }". * Here is its syntax − var identifier = { key1:value1, key2:value2 [,…..,key_n:value_n] }

Question 56

Declaring a Map using a Map Constructor

Answer 56

1. declar map 2. initialize map

Question 57

Map - Functions

Answer 57

**1. addAll()** - add key value pairs **2. clear()** - remove all pairs from map **3. remove()** - removes key adn associated value **4. forEach()** - applies f to each key-value pair of mal

Question 58

Map – Properties

Answer 58

**1**. **Keys** - Returns an iterable object representing keys **2**. **Values** - Returns an iterable object representing values **3**. **Length** - Returns the size of the Map **4**. **isEmpty** - Returns true if the Map is an empty Map **5**. **isNotEmpty** - Returns true if the Map is an empty Map

Question 59

refers to the current instance of the class.

Answer 59

this