JavaScript Midterm

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What is the difference between HTML, CSS and JavaScript?

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32 Terms

1

What is the difference between HTML, CSS and JavaScript?

HTML=structure/framework

CSS=design

JavaScript=interactive features

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2

How does the computer interpret the world through code?

Uses a model of an object; object-oriented programing

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3

Describe objects:

*objects are things:

-they have properties, events, and methods

-properties+events+methods=object

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4

Describe events:

*involve user interactions

-programmers choose what events trigger a specific section of code

-scripts can trigger different types of functionality

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5

Describe methods:

*how people interact with objects

-second part of the code after period (member operator)

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6

Identify the event and method

document.write(‘Good afternoon!’)

   event                 method

|------------| |-----------------------------|

document.write(‘Good afternoon!’)

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7

Describe how computers interpret the code:

Events trigger methods and methods retrieve or update an objects properties

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8

Describe variables

store temporary bits of information to perform a task

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9

Identify the variable and name

var boldColor | let boldColor

variable name

|----| |---------|

var boldColor

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10

what are the variable keywords?

var

let

const

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11

how do you declare a variable?

give it a name (identifier)

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12

describe value

data that is stored within the variable

a value must be assigned to a variable

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13

What are the different data types?

Numeric, strings, boolean

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14

Describe the numeric data types

can be decimals or negative numbers

cannot have commas

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15

describe strings

consist of letters and characters

add content to a page

always within ‘single’ or “double” quotation marks

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16

describe booleans

can only have 1 of 2 values, true or false

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17

describe arrays

a special type of variable that stores a list of values

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18

what are the characteristics of an array

always in [square brackets] or array()

used for a list or set of values, useful if the number of items will vary

always separated by commas, uses ‘single’ or “double” quotes

index starts with 0

ex:

let stopLight;

stopLight = [‘yield’, ‘stop’, ‘walk’];

stopLight[1] = ‘go’

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19

describe what is happening in this script

ex:

let stopLight;

stopLight = [‘yield’, ‘stop’, ‘walk’];

stopLight[1] = ‘go’

stopLight has an index of 1 which would be stop, but it is set equal to go, so stop is being changed to go making the stopLight array [‘yield’, ’go’, ‘walk’]

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20

describe expressions

result in a single value

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21

describe operators

used to create a single value from one or more values

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22

what are the 4 different operators?

assignment (=)

string (+)

logical (&&)

comparison (> | <)

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23

what is the assignment operator

=

assigns a value to a variable

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24

what is the string operator

+

combines two strings

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25

what is the logical operator

&&

combines expressions as true or false (boolean)

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26

what is the comparison operator

<

compares values

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27
<p>explain this script</p>

explain this script

knowt flashcard image
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28

describe functions

a series of statements that are grouped to perform a task

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29

describe conditions

conditions determine a path to take

returns a true or false value (boolean)

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30

describe conditional statements

if a condition is met, then a statement is executed

else code executes a different statement (AKA code skips ahead)

if statements compares value to true

else if the value is false

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31

describe the DOM

document object model

views and changes the output of HTML without actually changing the original HTML

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32

what is the entry node of the DOM tree?

document node

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