Javascript

Front 1

To access an HTML element from JavaScript, you can use this method

Back 1

getElementById

Front 2

write a statement that tells the browser to write "Hello Dolly" inside an HTML element with id="demo"

Back 2

document.getElementById("demo").innerHTML="Hello Dolly";

Front 3

separates javascript statements. added at the end of each executable statement. makes it possible to write many statements on one line.

Back 3

;

Front 4

javascript elements are executed in what order

Back 4

in the sequence they are written

Front 5

groups of javascript statements

Back 5

blocks

Front 6

can be used to break up a code line WITHIN A TEXT STRING

Back 6

\

Front 7

single line comments stat with this

Back 7

//

Front 8

Multi-line comments start with _____ and end with ____

Back 8

/*
*/

Front 9

containers for storing information in JavaScript

Back 9

JavaScript variable

Front 10

used to declare a javascript variable

Back 10

var

Front 11

a text value is called a ____

Back 11

string

Front 12

When you assign a text value to a variable, but ______ around the value.

Back 12

double or single quotes

Front 13

When you assign a numeric value to a variable, should you put quotes around the value?

Back 13

No.

Front 14

creating a variable in JavaScript is most often referred to as ________ a variable

Back 14

declaring

Front 15

Used to assign a value to a variable

Back 15

=

Front 16

write a statement to declare a variable called "carname." Assign the value "Volvo" to the variable

Back 16

var carname="Volvo";

Front 17

write code that creates a variable called carname, assigns the value "Volvo," and puts the value inside an HTML paragraph with an id of "demo"

Back 17

var carname="Volvo";
document.getElementById("demo").innerHTML=carname;

Front 18

According to good programming practice, where should all variables be declared?

Back 18

In one place at the beginning of your code.

Front 19

If you declare a variable without a value, what happens?

Back 19

The variable will have the value - undefined

Front 20

Why might a variable be declared without a value

Back 20

The value could be something that has to be calculated or something that is provided later, like a user input.

Front 21

If you re-declare a variable without a value, will it lose it's current value?

Back 21

No

Front 22

Javascript has _______ ______, meaining that the same variable can be used as different types.

Back 22

dynamic types

Front 23

a variable that stores a series of characters like "John Doe" are called ________

Back 23

a string.

Front 24

What is the rule for using quotes inside a string?

Back 24

You can use quotes inside a string, as long as they don't match the quotes surrounding the string.

Front 25

Can numbers be written with decimals in Javascript?

Back 25

Yes.

Front 26

Extra large or extra small numbers can be written with ________ (_______) ________

Back 26

scientific (exponential) notation.

Front 27

What 2 values can Booleans have?

Back 27

true or false.

Front 28

Booleans are often used in _______ ______.

Back 28

conditional testing.

Front 29

write a series of statements that create an array called cars with the values of Saab, Volvo, and BMW.

Back 29

var cars=new Array();
cars[0]="Saab";
cars[1]="Volvo";
cars[2]="BMW";

Front 30

write a condensed array called cars with the values of Saab, Volvo, and BMW.

Back 30

var cars = new Array("Saab","Volvo","BMW");

Front 31

write a literal array called cars with the values of Saab, Volvo, and BMW.

Back 31

var cars = ["Saab","Volvo","BMW"];

Front 32

an object is delimited by __

Back 32

{}

Front 33

Inside curly braces, an object's properties are defined as _______ and _______ _______.

Back 33

Name and value pairs (name : value)

Front 34

What are object properties separated by?

Back 34

commas (,)

Front 35

write a statement to create an object named "Person." Assign the name of firstname with a value of John, a name of lastname with a value of Doe, and a name of id with the value of 5566.

Back 35

var person={
firstname : "John",
lastname : "Doe",
id : 5566
};

Front 36

In what 2 ways can you address object properties?

Back 36

name=person.lastname;
name=person["lastname"];

Front 37

the value of a variable with no value is

Back 37

undefined

Front 38

variables can be emptied by setting the value to _____

Back 38

null

Front 39

When you declare a new variable, you can declare its type using this keyword.

Back 39

new

Front 40

Are variables objects?

Back 40

yes

Front 41

data, with properties and methods.

Back 41

object

Front 42

values associated with an object

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properties

Front 43

actions that can be performed on objects

Back 43

methods

Front 44

In object oriented languages, this is another name for properties and methods

Back 44

object members

Front 45

the syntax for accessing the property of an object

Back 45

objectName.propertyname

Front 46

the syntax for calling a method

Back 46

objectName.methodName()

Front 47

in object oriented languages, it is common to use _____-____ function names.

Back 47

camel-case (ie: functionName)

Front 48

a block of code that will be executed when someone calls it

Back 48

function

Front 49

JavaScript Function Syntax

Back 49

a code block inside curly braces, preceded by the keyword "function."

Front 50

At what point is the code inside a function excecuted

Back 50

when someone calls the function

Front 51

what caps is used when using the function keyword

Back 51

lower case

Front 52

what do you call a value that is passed into a function?

Back 52

argument or parameter

Front 53

How many arguments can be passed into a function

Back 53

As many as are desired

Front 54

how do you separate multiple arguments within a function?

Back 54

using a comma

Front 55

A statement that is used to return a value back to where the call was made

Back 55

return

Front 56

Can you use a return statement to exit a function?

Back 56

Yes

Front 57

A variable declared (using var) within a JavaScript function becomes ___________ and can only be accessed from within that function.

Back 57

Local

Front 58

Can you have local values with the same name in different functions? Why or why not?

Back 58

Yes, because local variables are only recognized by the function in which they are declared.

Front 59

Variables declared outside of a function are ________ and all scripts and function on the web page can access it.

Back 59

Global

Front 60

When are local variables deleted?

Back 60

When the function is completed

Front 61

When are global variables deleted

Back 61

When the page is closed.

Front 62

If you assign a value to a variable that has not yet been declared, what happens?

Back 62

The variable will automatically be declared as a global variable.

Front 63

What operator is used to assign values to JavaScript variables

Back 63

=

Front 64

What is the arithmetic operator for Modulus (division remainder)?

Back 64

%

Front 65

What is the arithmetic operator for incremental values

Back 65

++

Front 66

What is the arithmetic operator for decremental values

Back 66

--

Front 67

What operator is used to add string variables or text values together?

Back 67

+

Front 68

Adding two numbers will return the sum. However, adding a number and a string will return a _________.

Back 68

String

Front 69

What operators can be used to test for True or False?

Back 69

Comparison and Logical operators

Front 70

Comparison operator for "is equal to"

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==

Front 71

Used in logical statements to determine equality or difference between variables or values

Back 71

Comparison operators

Front 72

Comparison operator for "is exactly equal to (value and type)

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===

Front 73

Comparison operator for "is not equal to"

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!=

Front 74

Comparison operator for "is not equal (neither value or type)"

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!==

Front 75

Used to determine the logic between variables or values

Back 75

Logical operators

Front 76

Logical operator for "and"

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&&

Front 77

Logical operator for "or"

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||

Front 78

Logical operator for "not"

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!

Front 79

Syntax for a conditional operator that assigns a value to a variable based on some condition.

Back 79

variablename=(condition)?value1:value2