JavaScript

Question 1

Which errors are typically syntax errors and usually cause error alerts?

Answer 1

Load-time errors

Question 2

Which method converts a string value to uppercase letters?

Answer 2

toUpperCase()

Question 3

Which methods determines whether a value is a number?

Answer 3

isNaN()

Question 4

What process combines two text strings using the plus sign?

Answer 4

concatenation

Question 5

Which method converts a string to its integer equivalent?

Answer 5

parseInt()

Question 6

What processes a function’s statements?

Answer 6

calling statement

Question 7

Which type of operator is this?

25 + 75

Answer 7

Arithmetic

Question 8

Which expression creates an integer value?

Answer 8

var birthYear = 1956

Question 9

How does a for loop start?

Answer 9

for (i = 0; i <= 5; i++)

Question 10

Which event occurs when the user moves the mouse pointer over a link, image, or other visible element on a page?

Answer 10

mouseOver

Question 11

What is a way of changing a variable from one data type to another?

Answer 11

casting

Question 12

Why is a reference technique used to access the property or method of an object?

Answer 12

dot notation

Question 13

Which type of operator is this?

myNumber = 25

Answer 13

Assignment

Question 14

Which operator is used to assign values?

Answer 14

=

Question 15

Which expression creates a string value?

Answer 15

var name = “Andrew”

Question 16

What is the actual data values you provide in JS?

Answer 16

literal

Question 17

Which event occurs when a user clicks the mouse button outside of a particular input field?

Answer 17

blur

Question 18

What does a one line JS comment look like?

Answer 18

// this

Question 19

Which data type holds any numeric value used for mathematical operations?

Answer 19

number

Question 20

Which event occurs when the user highlights the text in a form field?

Answer 20

select

Question 21

What type of variable is declared within a function and available only from within that function?

Answer 21

local variable

Question 22

Which method converts a string to its floating point decimal equivalent?

Answer 22

parseFloat()

Question 23

What is a symbol or character used in expressions to store or evaluate a value?

Answer 23

operator

Question 24

What is a part of a statement that is evaluated as a value?

Answer 24

expression

Question 25

How do you declare a function?

Answer 25

function myFunction() {}

Question 26

What is a self-contained programming component that contains properties and methods?

Answer 26

object

Question 27

What are key characteristics and features of JavaScript?

Answer 27

an object-based language based on event-driven model platform independent enables quick development relatively easy to learn

Question 28

How do you apply inline scripting to an element?

Answer 28

click here

Question 29

Which event occurs when the user modifies the value of a form field?

Answer 29

change

Question 30

Which event occurs when the user clicks on a link or form element?

Answer 30

click

Question 31

Which type of operator is this? 25 < 75

Answer 31

Logical

Question 32

What happens if you define a function but do not call it?

Answer 32

nothing

Question 33

Which method creates a pop up box with the specified message string and requests user input into the text field in the box?

Answer 33

prompt()

Question 34

What is a named set of statements that performs a task or calculates a value?

Answer 34

function

Question 35

How do you call this function? ``` function myFunction() { return “success”; } ```

Answer 35

myFunction()

Question 36

Which event occurs when a page is closed?

Answer 36

unload

Question 37

Which errors are mathematical, casting errors, errors in proper command usage, or errors in the structure of the script, which result in the script running improperly?

Answer 37

Logic errors

Question 38

Which technique adds JS to a singe web page within either the or the ?

Answer 38

embedded scripting

Question 39

Which object allows you to determine information about the user’s browser?

Answer 39

navigator

Question 40

Which method creates a pop-up box with the specified message string, which the user can dismiss by clicking a button in the box?

Answer 40

alert()

Question 41

Which property returns a string value indicating the name of the client browser?

Answer 41

navigator.appName

Question 42

Which technique adds JavaScript to a single HTML element?

Answer 42

Inline scripting

Question 43

How do you find a number with the highest value of x and y?

Answer 43

Math.max(x,y)

Question 44

What must variable names begin with?

Answer 44

a letter the underscore _ the dollar sign $

Question 45

Which technique adds JS by linking web pages to a text file with the .js file name extension?

Answer 45

external scripting

Question 46

What is a value or expression containing data or code that is passed on to a function?

Answer 46

argument

Question 47

How do you round the number 7.25 to the nearest integer?

Answer 47

Math.round(7.25)

Question 48

Which event occurs when there is a problem loading an external image or resource?

Answer 48

error

Question 49

What does a JS comment with more than one line look like?

Answer 49

``` /* like this */ ```

Question 50

What is a named space of memory?

Answer 50

variable

Question 51

Which event occurs when a form’s Submit button is clicked?

Answer 51

submit

Question 52

Which data type holds True or False values only?

Answer 52

Boolean

Question 53

What are actions that an object can be made to perform?

Answer 53

methods

Question 54

What type of variable is available throughout the entire script?

Answer 54

global variable

Question 55

Which value indicates that a variable has no value assigned yet?

Answer 55

undefined

Question 56

What are attributes of an object (e.g., height, color, font size, sentence length, etc.)?

Answer 56

Properties

Question 57

What describes when values are passed to a function, and the function’s parameters receive a copy of its arguments values? ``` function myFunction(x) { return x; } ``` ``` var num = 2; myFunction(num); ```

Answer 57

pass by reference

Question 58

What is the correct way to change the content of the HTML element below?

this is a demo

Answer 58

document.getElementById(“demo”).innerHTML = “Hello World!”;

Question 59

What is used to output values from a function?

Answer 59

return

Question 60

Which errors occur after the script has loaded and is running, typically caused by improper use of commands?

Answer 60

Run-time errors

Question 61

Which type of operator is this? z == 10

Answer 61

Comparison

Question 62

Which value indicates that the user enters nothing in a text box then submits the form?

Answer 62

null

Question 63

Which method creates a pop up box with the specified message string and requests user confirmation by clicking OK or Cancel button in the box?

Answer 63

confirm()

Question 64

How do you write an if statement if i is not equal to 5?

Answer 64

if (i != 5)

Question 65

What is the correct syntax to open a new window?

Answer 65

w2 = window.open(“URL”);

Question 66

Which property returns a string value indicating the version number of the client browser and the platform?

Answer 66

navigator.appVersion

Question 67

Which event occurs when a page is opened?

Answer 67

load

Question 68

Which method writes the specified string in the page?

Answer 68

document.write()

Question 69

Which data type holds any string of alphanumeric characters used for words or for numbered phrases that are not mathematically manipulated?

Answer 69

string

Question 70

How to write an if statement in JS?

Answer 70

if (i == 5)

Question 71

Which event occurs when the mouse pointer leaves a link, image, or other visible element on a page?

Answer 71

mouseOut

Question 72

Which event occurs when a firm’s Reset button is clicked?

Answer 72

reset

Question 73

Which event occurs when the loading of an image is terminated?

Answer 73

abort

Question 74

Which event occurs when a user clicks into a form field?

Answer 74

focus

Question 75

Does JS perform its functionality primarily on the client or server-side?

Answer 75

client side

Question 76

What describes when values are passed to a function, and the function’s parameters receive its argument’s actual values? ``` function myFunction(x) { return x; } ``` myFunction(2);

Answer 76

pass by value

Question 77

Which type of operator makes decisions in a script? (a > b) ? a++ : a- -

Answer 77

Conditional

Question 78

How does a while loop start?

Answer 78

while (i <= 10)