unit 4

Question 1

what is a variable?

Answer 1

container for storing value

Question 2

what does the computer do once a variable is created?

Answer 2

stores it in memory

Question 3

what is the code for a variable?

Answer 3

var + label

Question 4

when should we use var?

Answer 4

to change its value

Question 5

where are the positions of the label and value?

Answer 5

label left, value right

Question 6

initializing the varable

Answer 6

creating and assigning variable value right away
var lives = 3;

Question 7

initializing the variable

Answer 7

creating and assigning variable value right away
var lives = 3;

Question 8

what does ‘=’ mean?

Answer 8

gets the value

Question 9

how do you use a variable?

Answer 9

refer it by its label

Question 10

how can you see the value of a variable?

Answer 10

by using console.log as we can’t visually see it

Question 11

what is the difference between writing the variable’s label with quotations and without?

Answer 11

with - refers to the name itself
without - refers to the value

Question 12

if a variable is not declared what happens?

Answer 12

the program does not know what it is and an error occurs

Question 13

example of variables in expression

Answer 13

var score = 3;
var newScore;
newScore = score + 1

Question 14

what is different with variables when you use expressions?

Answer 14

you don’t assign a value directly

Question 15

how much a computer determine an expression

Answer 15

use the current value and manipulate it (add, subtract etc) the way the expression wants it to
computer picks apart the expression

Question 16

variable re-assignment

Answer 16

updating values of variables

Question 17

why does the order of variables matter?

Answer 17

in expressions, the updates change right then and then that new value is applied to the next line

Question 18

how does a computer make decisions to see what action to take next?

Answer 18

true or false

Question 19

what is a boolean expression?

Answer 19

can be either true/false
computer can evaluate it

Question 20

what is the equality operator?

Answer 20

==

Question 21

what is the assignment operator?

Answer 21

=

Question 22

what are comparison operators?

Answer 22

> , >=, <, <=, !=

Question 23

what do operators do?

Answer 23

propose a question for the computer to answer

Question 24

what are conditional statements?

Answer 24

tells computer to run specific code if something is true

Question 25

types of conditional statement

Answer 25

if
if-else
if-else-if

Question 26

how does computer check codes?

Answer 26

top to bottom

Question 27

OR operators

Answer 27

||
true when at least one condition is true

Question 28

AND operators

Answer 28

&&
true when both conditions are true

Question 29

how do computers use conditional statements?

Answer 29

use it to adapt to changes

Question 30

what is a function?

Answer 30

define your command and giving it a name

Question 31

2 steps to use a function

Answer 31

1. define- give a single name to a set of actions you want to perform
2. call - type name of function followed by ()

Question 32

where do you place the definition of the function in a code?

Answer 32

anywhere as the computer will search for it
but for organization, usually placed at the end

Question 33

the javascript term is function, but what is the general term?

Answer 33

procedure