UNIT 2: FLUTTER

Question 1

• compiled, statically typed, object oriented, procedural programming language
• very mainstream structure much like other OO languages, making it easy to pick up folks who have experience with Java, C++, C#
• add some features that developers in those other languages would not expect but are very cool nonetheless

Answer 1

Dart

Question 2

can store any data type; data type can change anytime

Answer 2

dynamic

Question 3

data type is inferred from the value on the right side “=”

Answer 3

var

Question 4

variable once set, cannot be reassigned

Answer 4

final

Question 5

value set at compile time, not run time

Answer 5

const

Question 6

variables are initialized to null

Answer 6

• int x
• double y
• bool z
• string s
• dynamic d

Question 7

the process of inserting variable values into placeholders in a string literal. To concatenate strings in Dart, we can utilize string interpolation. We use the ＄{} symbol to implement string interpolation in your code.

Answer 7

String interpolation $

Question 8

multiline strings

Answer 8

create using “””

Question 9

spread elements into the array

Answer 9

spread operator …

Question 10

they can be passed down like data, returned from a function, passed into a function as a parameter or set to equal a variable

Answer 10

functions are first-class objects

Question 11

function that returns a value in one line of code

Answer 11

Big arrow
=>

Question 12

sendEmail(‘ceo@blue.company’,’Pop’);
to
sendEmail(subject:’Pop’, atAddress: ‘ceo@blue.company’);

Answer 12

named function parameters

Question 13

Person p = Person();

Answer 13

ommit “new” and “this”

Question 14

shorter way of dart classess which rceive paramaters

Answer 14

class constructor parameter firsthand

Question 15

all members of dart are what in default

Answer 15

public

Question 16

return to this class but before you do, do something with a return method

Answer 16

cascading operator
(..)

Question 17

Person.withName

Answer 17

Named constrcutor example

Question 18

foundational widgets are the building blocks of everything we create - 160 of them

Answer 18

flutter

Question 19

• certain widgets may hold value that came from storage, internet, or user themselves
• display value to the user and get value from the user into the app

Answer 19

value widget
* CheckBox
* Icon
* IconButton

Question 20

gives controls in the making scene of layout properly

Answer 20

layout widget
* Card
* Center
* Column

Question 21

when your screen has multiple scenes, you’ll need a way to move them

Answer 21

navigation widget
* TabBar
* TabBarView
* MaterialApp

Question 22

not all widgets fall in the neat category, these are the miscellaneous widgets

Answer 22

other widgets
* theme
* transform
* transition

Question 23

Flutter’s excellent architechture was influenced from

Answer 23

React

Question 24

shows the tiny copy of all the widgets in the screen

Answer 24

element tree

Question 25

Four widget categories

Answer 25

1. value widget
2. layout widget
3. navigation widget
4. other widget

Question 26

it is needed so rarely that we are going to be satisfied if you understand that:

Answer 26

1. keys exist and why flutter need them
2. if widgets are not redrawn as expected during data changes, keys solve the problem
3. u have the oppportunity to assign keys to a certain widget

Question 27

flutter formula

Answer 27

Scene = f(data)

Question 28

dart syntax

Answer 28

1. list input parameters in the constructors
2. make sure to use “this”
3. mark corresponding class as final

Question 28

• does not maintain its own state
• just display the information
• always use this widget

Answer 28

stateless

Question 29

data within the widget that can chanhe during the lifetime

Answer 29

stateful

Question 30

basket properties that can be added in to any class

Answer 30

mixin