JAVASCRIPT

Question 1

Where does JavaScript run?

Answer 1

In the browser, no need for a development environment.

Question 2

What is built-in the browser to run JavaScript code?

Answer 2

The JavaScript console.

Question 3

How do you open the JavaScript console?

Answer 3

ctrl+shft+J

Question 4

How do you clear the console?

Answer 4

by pressing the circular icon with the bar running through it.

Question 5

What is a line of JavaScript code called?

Answer 5

A JavaScript statement.

Question 6

How to bring up a pop-up box with a statement on it?

Answer 6

alert();

Question 7

How to bring up the previous command on the console?

Answer 7

use the up arrow.

Question 8

Code for a dialog-box with the words “hi” …

Answer 8

alert(“hi”);

Question 9

Code to send a message to the console with the word “Hello” …

Answer 9

console.log(“Hello”);

Question 10

Code to send the text “Hi” to the webpage you’re on …

Answer 10

document.write(“Hi”);

Question 11

How do you to the next line in the console without entering your current line of code?

Answer 11

shft + return

Question 12

Code to write an < H1 > with the text “Fuck You” to the current webpage you’re on …

Answer 12

document.write( “ < h1 > Fuck You < / h1 > “ );

Question 13

How does code run?

Answer 13

line by line

Question 14

Where do you place JavaScript code?

Answer 14

In a seperate file, but in the same folder of your html, much like a CSS file.

Question 15

What executes JavaScript code?

Answer 15

The JavaScript engine built into the browser.

Question 16

What extension do JavaScript files have?

Answer 16

.js

Question 17

Where are JavaScript links usually placed in HTML files?

Answer 17

Just before the ending < body > tag.

Question 18

Code for a link from an html file to a JavaScript file named script.js which is in a file named js …

Answer 18

< script src = “ js / script.js “ > < / script >

Question 19

Can you link more than one JavaScript file in your html file?

Answer 19

YES, YES a thousand times YES, ALREADY!!!

Question 20

Where are JavaScript errors logged?

Answer 20

In the JavaScript console.

Question 21

What info will be listed on the error line in the console?

Answer 21

the file and line of error

Question 22

Is JavaScript case sensitive?

Answer 22

YES

Question 23

How do you write a JavaScript comment?

Answer 23

// till eol, end of line

/* mutline

like

this */

Question 24

What are the three ways you can declare a JavaScript variable?

Answer 24

var

let

const

Question 25

Declare a variable named score …

Answer 25

var score;

const score;

let score;

Question 26

Declare and assign a value, 0, to the variable named score …

Answer 26

var score = 0;

let score = 0;

const score = 0;

Question 27

What is meant by “reassigning a variable”?

Answer 27

It is when you overwrite a value in a variable with a new value.

var score = 0;

score = 1;

notice you don’t have to write var twice, which is nice.

Question 28

Which type of variable can you not use to reassign a value to?

Answer 28

const

Question 29

What are some of the rules for naming variables?

Answer 29

1. Variable names cannot start with a number. (9lives, no good).
2. Names can only contain letters, numbers, and the $ and _ characters.
3. Use camelCase for multiWord variable names.
4. Make variable names meaningful.
5. Don’t use KW’s.

Question 30

Code an example of the addition assignment operator …

Answer 30

var score = 5;

score += 10;

console.log(score);

what would score be now?

15

Question 31

Code showing how you can use variable names to add up values just as you would use numbers …

Answer 31

var score = 15;

var bonusPoints = 100;

var finalScore = score + bonusPoints;

document.write(finalScore);

115

Question 32

What can one say about spacing around the = in JavaScript?

Answer 32

_ = _

Question 33

How do you list strings?

Answer 33

Use double quotation marks “some string”.

Question 34

How would you use html in a string?

Answer 34

If you’re using html in a string and have to use double quotes, use single quotes outside your string …

const htmlSnippet = ‘ < h1 class = “ headline “ > ‘

Question 35

What is an escape character and how would you use it?

Answer 35

\ is the escape character and you use it before a character you want to use literally and not code-wise, i.e. …

const message = ‘ I'm a programmer ! ‘ ;

Question 36

How to use an escape character when dealing with multi-line strings?

Answer 36

const multiLine = “ Hello , students \

Welcome to JS

Question 37

Code to find the length of a string …

Answer 37

const passPhrase = “Open Sesame”;

console.log(passPhrase.length);

11

Question 38

In JavaScript what is an action you can take called?

Answer 38

this one is called a method

Question 39

Code for making a string all lower case …

Answer 39

const passPhrase = “I have spoken”;

console.log(“ passPhrase.toLowerCase());

>i have spoken

Question 40

Code to list a string to all upper case …

Answer 40

const passPhrase = “i have spoken”;

console.log(passPhrase.toUpperCase());

>I HAVE SPOKEN

Question 41

How to code for a question dialog box and to get a response to use somehow …

Answer 41

use the prompt() …

prompt(“What is your major malfunction?”);

Question 42

How would you use the prompt to save some value …

Answer 42

const name = prompt(“What is your name?’);

console.log(name);

or

alert(name);

or

document.write( “ < h1 > name < / h1 > “ );

Question 43

What is the process called when combining two or more strings together?

Answer 43

this one is called string concatenation

Question 44

How to code to concatenate two string together?

Answer 44

“My favorite” + “Movies”;

My favorite Movies

Question 45

How to code using a prompt and a string …

Answer 45

const name = prompt(“What is your name?”);

const message = “ Hello “ + name;

console.log(message);

or

alert(message);

or

document.write(message);

Question 46

Code for using a template literal …

Answer 46

const name = prompt(“What is your name?”);

const message = Hello, ${name};

console.log(message);

Question 47

What are some true “things” about template literals?

Answer 47

1. With template literals you don’t have to worry about spaces or escape characters.
2. With template literals you can write multi-line strings w/out any special characters, no back-slash for example.

Question 48

How to display a value of a string onto a page …

Answer 48

It’s a two step process:

1. Select the html element where you want your content to appear:
   document. querySelector(‘main’);
2. What content you want to insert into that element.

Question 49

Code using a querySelector …

Answer 49

const message = “What the fuck … over”;

document.querySelector(‘main’).innerHTML = message;

Question 50

Code using some template literals using Great Gatsby …

Answer 50

const title = “ The Great Gatsby “;

const price = “ 14.99 “;

const book = ${title} : \$\${price};