Programming

Question 1

Callback function

Answer 1

a function specified as part of an event listener; it is written by the programmer but called by the system as the result of an event trigger.

Question 2

Event

Answer 2

An action that causes something to happen.

Question 3

Event-driven program

Answer 3

a program designed to run blocks of code or functions in response to specified events (e.g. a mouse click)

Question 4

Event handling

Answer 4

an overarching term for the coding tasks involved in making a program respond to events by triggering functions

coding tasks involved in making your app respond to events by triggering functions

Question 5

Event listener

Answer 5

a command that can be set up to trigger a function when a particular type of event occurs on a particular UI element.

Question 6

UI Elements

Answer 6

on-screen objects, like buttons, images, text boxes, pull down menus, screens and so on.

Question 7

User Interface

Answer 7

The visual elements of a program through which a user controls or communicates with the application. Often abbreviated UI.
refers to how a person (user) interacts with the computer or app.

Question 8

Users trigger events

Answer 8

Events occur when users click a button, tap the screen, move the mouse, type a key on the keyboard, etc.

Question 9

what does context sensitive mean?

Answer 9

properties tab is context sensitive which means that the set of properties you see depends on what you click on in the application

Question 10

what is an element id?

Answer 10

you refer to the element in your code.

Question 11

UI Elements

Answer 11

objects, like buttons, images, text boxes, pull down menus, screens and so on.

Question 12

UI Events

Answer 12

controls, like click, scroll, move mouse, type keyboard key, etc.

Question 13

Events trigger code

Answer 13

When an event occurs or “fires” it can be used to trigger a particular javascript function

Question 14

debugging

Answer 14

writing any code and it’s an error, or didn’t work for any other reason and you dug in and figured out why and fixed it

Question 15

characteristics of IDs

Answer 15

case sensitive
cannot contain spaces
must begin with a letter (A-Z or a-z) and may be followed by any number of digits and letter
can contain hyphens “-“, “_”, “.”, “:”

Question 16

rules with variables

Answer 16

use “var” only once
create your variables at the top of your program
create variables outside onEvent blocks

Question 17

global variables

Answer 17

Permanent. Can be used anywhere in your code
var used outside an onEvent

Question 18

local variable

Answer 18

Temporary. Can be used only in the part of the code where it was created, like inside an onEvent. Deleted once the onEvent is done running.
var used inside an onEvent

Question 19

what do if-else-if commands do

Answer 19

lets you check multiple boolean conditions

Question 20

what are boolean conditions?

Answer 20

a conditional expression
consists of chained conditionals and nested conditionals

Question 21

how will computers check if-else-if commands?

Answer 21

check conditions in the order they are written until one of the boolean expressions evaluates to true
code associated with that boolean expression will be run, but all others will be skipped
If none of the expressions evaluates to true then the code inside the else command will be run.

Question 22

how to write if-else-if statments?

Answer 22

most specific cases first

Question 23

chained conditionals

Answer 23

else/else-if

Question 24

nested conditionals

Answer 24

if statements inside of if statements

Question 25

pseudocode

Answer 25

structural conventions of a programming language, but is intended for human rather than machine reading

Question 26

is not equal to in javascript

Answer 26

!=

Question 27

NOT operator

Answer 27

!
evaluates to the opposite truth value of the statement provided as input

Question 28

placement of NOT operator

Answer 28

place the expression to which you want to apply the NOT within parentheses
ex. if (!(expr))

Question 29

AND operator

Answer 29

&&
evaluates to true only when both boolean statements it connects are true

Question 30

what does the AND operator help with?

Answer 30

redundancy and improved overall readability

Question 31

placement of AND operator

Answer 31

place each boolean expression inside of itws own parenthesis
ex. if ((age=>13) && (age<20)) {

Question 32

OR operator

Answer 32

||
evaluates to true as long as at least one of the boolean statements it connects is true

Question 33

what does OR operator help with?

Answer 33

redundancy and readability

Question 34

placement of OR operator

Answer 34

placed each boolean expression insdie its own parentheses
ex. if ((day == “Saturday”) || (day == “Sunday”)) {