Inputs, outputs, and debugging

Question 1

DOM

Answer 1

Document object model

Question 2

Document.Object.Model represents (3)

Answer 2

Document Object Model

Document - web page - index.html
Object - pieces or individual tags/elements - H1 tag, etc.
Model - agreed upon set of terms

Question 3

batch program

Answer 3

• a program that is designed to start from finish to end as soon as possible, and potentially produce and output
• example: anti-virus scanner
• most programs nowadays are not designed to start and finish as soon as possible. they allow you to interact with them through a graphical user interface.

Question 4

persistence

Answer 4

saving the state of the program

Question 5

what kind of persistence (saving ability) exists in javascript?

Answer 5

None! At least not at the basic level!

It doesn’t exist due to security concerns. But other programming languages such as java or objective C which runs natively on your OS will allow you to save files onto your hard drive.

Question 6

example of a few different javascript events

Answer 6

1) unload
2) onclick
3) onmouseover
4) noblur
5) onfocus

Question 7

what takes longer, writing code or debugging code?

Answer 7

debugging

Question 8

errors in code (2)

Answer 8

1) syntax error

2) logic error

Question 9

error in code

syntax error

Answer 9

• something is wrong with the ACTUAL format of the code

- forgot a semi colon, wrong number of braces, brackets, etc…

Question 10

syntax error

• compiled vs. interpreted language

Answer 10

• in compiled languages, syntax errors are normally found while writing the code
• with interpreted code, you sometimes just have to run code before you know if there’s a syntax terror

Question 11

error in code

*logic error

Answer 11

• correct in syntax but there’s a flaw in the logic
• problem with arithmetic
• infinite loop

Question 12

best way to fix an error in code:

Answer 12

reproduce the same error

find out when the error occurs and how it occurred

Question 13

trace

Answer 13

• finding out where the code when wrong by leaving messages in your code or functions.

Question 14

trace messaging is sometimes called…

Answer 14

logging to the console

Question 15

In object oriented programming, these “objects”….

Answer 15

communicate with one another

Question 16

Class

Answer 16

The blueprint, the description, and the definition

Question 17

If you wrote “classes” for a restaurant-review website, some classes would be (9)

Answer 17

• restaurant
• review
• user
• textbox
• button
• window
• date
• timezone
• Videoplayer

Of course, there’s more.

Question 18

An attribute (english word) is akin to a . . . (computing word)

Answer 18

property

Question 19

A behaviour (english word) is akin to . . . (computing word)

Answer 19

a method, a function

Question 20

a property or a method?

*name

Answer 20

property

Question 21

a property or a method?

*sleep

Answer 21

method

Question 22

a property or a method?

*speak

Answer 22

method

Question 23

a property or a method?

*gender

Answer 23

property

Question 24

a property or a method?

*run

Answer 24

method

Question 25

a property or a method? *age

Answer 25

method

Question 26

a property or a method? *gender

Answer 26

property

Question 27

a property or a method? *jump

Answer 27

method

Question 28

a property or a method? *height

Answer 28

property

Question 29

a property or a method? *weight

Answer 29

property

Question 30

A class is a/an __________ as the object is the thing

Answer 30

idea

Question 31

A class is an idea and the object, is the _________

Answer 31

thing

Question 32

encapsulation

Answer 32

the idea the classes and objects are self contained entities, and that we box them up together to produce our end product

Question 33

var isValid = true; is of type

Answer 33

boolean

Question 34

primitives

Answer 34

primitives store a value

Question 35

object or primitive? *var myArray = [1, 2, 3, 4, 5];

Answer 35

object

Question 36

object or primitive? *var myNumber = 123;

Answer 36

primitive

Question 37

object or primitive? *var isValid = true;

Answer 37

primitive

Question 38

object or primitive? *var myRe = /hello/;

Answer 38

object

Question 39

object or primitive? *date

Answer 39

object

Question 40

create today's date in javascript

Answer 40

var today = new Date( );

Question 41

create halloween date

Answer 41

var halloweenDate = new Date(2016, 1, 1)

Question 42

classes in javascript (4)

Answer 42

1) array 2) RegExp (regular expression) 3) Date 4) Math

Question 43

javascript classes are .... compared to other languages

Answer 43

limited

Question 44

of the main languages, which one is the "purest" object oriented language?

Answer 44

ruby

Question 45

basic pseudo code for memory management in object oriented programming (4)

Answer 45

1) allocate memory (choose memory you want to use) 2) create object 3) use object 4) free memory

Question 46

memory leak

Answer 46

- when you don't "free memory" after use | - causes programs to become slow

Question 47

dangling pointer

Answer 47

- when you "free memory", but have a variable pointed at a specific piece of memory - you then try to use that variable but the variable doesn't exist because you "freed memory". - causes programs to crash

Question 48

reference counting

Answer 48

- used be Objective-C and C++ for memory management | - allows us to keep a counter of what memory is being used

Question 49

garbage collection

Answer 49

- the system itself keeps track of how the much memory the application is using - it is called garbage collection because the "freeing of memory" happens all at once, not slowly. You actually don't have control of WHEN garbage is collected.

Question 50

in Scripting language, memory management is...

Answer 50

automatic

Question 51

problem with automatic memory management

Answer 51

- can be slow

Question 52

bubble sort

Answer 52

- considered a slow method to sort numbers

Question 53

in terms of programming (sorting for example), you have to decide between (3)

Answer 53

1) ease of use 2) speed 3) elegance (easy to understand)

Question 54

multi-tasking

Answer 54

running many programs at once

Question 55

multi-threading

Answer 55

doing multiple things in one program

Question 56

multithreading challenges

Answer 56

1) competition for RAM or other resources 2) Restriction on updating UI 3) language support 4) Web Work -- future feature for Javascript through an update in HTML5