Javascript

Question 1

What are the 6 types of values in JavaScript?

Answer 1

Numbers,
Strings,
Booleans,
Objects,
Functions,
Undefined

Question 2

What type of operator is this: =

Answer 2

Assignment operator, Assigns value to a variable

Question 3

What type of operator is this: +

Answer 3

Addition operator, adds values

Question 4

What type of operator is this: -

Answer 4

Subtraction operator, subtracts values

Question 5

What type of operator is this: /

Answer 5

Division operator, divides values

Question 6

What type of operator is this: %

Answer 6

Remainder operator, divides values and gives back the remainder.

Example: 27 % 16 = 11. Because 27 / 16 = 1 with a remainder of 11.

Question 7

What type of operator is this: ++

Answer 7

Increment operator, adds 1 to its operant and returns the value

Question 8

What operator is this: –

Answer 8

Decrement operator, subtracts 1 from its operant and returns the value

Question 9

What is an operand?

Answer 9

An operand is a value that is being acted upon by an operator

Question 10

String

Answer 10

Used to represent text. Written in quote marks.

Ex: “This is a string”

Question 11

\ ~In the context of a string~

Answer 11

Escaping. This signifies in a string that the next character is important.

Ex: “This is a "quote"”
Result: This is a “quote”

Question 12

\n

Answer 12

New line
Ex: “Hello Top \nHello Bottom”
Result: Hello Top
Hello Bottom

Question 13

\t

Answer 13

Tab in a string.

Question 14

\

Answer 14

Backslash in a string

Question 15

"

Answer 15

Quote marks in a string.

Question 16

Concatenation

Answer 16

Adding strings together.
Ex: “Con” + “cat” + “e” + “nate”
Result: Concatenate

Question 17

Boolean Values

Answer 17

Values that are true or false.

Question 18

Comparison operators

Answer 18

> Greater than
< Less than
>= Greater than or equal to
<= less than or equal to
== equal value
=== equal value and type
!= not equal to

Question 19

True or false? Strings can be compared using comparison operators?

Answer 19

Kind of true. They can be compared in alphabetical order based on the Unicode order.

Question 20

Logical Operators

Answer 20

And (&&), Or(||), Not(!)

Question 21

And operator

Answer 21

&&

Result is true if both values are true

Question 22

Or operator

Answer 22

||

Result is true if either value is true.

Question 23

Not operator

Answer 23

!

Result is flipped.
Ex:

!true = false

Ex2:

!false = true

Question 24

True or False: Undefined and Null are essentially the same.

Answer 24

True

Question 25

What is an expression?

Answer 25

A fragment of code that produces a value. Every value written literally i.e. "Cat" or 22.

Question 26

What is a variable and what is the keyword that indicates a variable?

Answer 26

A variable is used to store a value for further manipulation. The key word is var. Ex: var Cat = "kitten";

Question 27

An = cannot be used on an existing variable to disconnect it from its current value, true or false?

Answer 27

False. An = can be used at any time to disconnect it from its current value.

Question 28

``` var luigisDebt = 140; luigisDebt = luigisDebt - 35; console.log(luigisDebt); ``` What should this program output?

Answer 28

105. (Refer to Notebook #1 page 14-15 for notes)

Question 29

Confirm("text"); What does this do?

Answer 29

Brings up a pop up confirmation box.

Question 30

Prompt("Where are you from?"); What does this do?

Answer 30

It pulls up a pop up with a prompt asking "Where are you from?" And provides a text field for entry.

Question 31

What does console.log() do?

Answer 31

It takes whatever is inside the parentheses and logs it to the console below your code. Also called printing out.

Question 32

Write a program that if "WordLength" is greater than or equal to 10 then the console output is "That is a long word!" Hint: Use if statement.

Answer 32

If ("wordlength.length >= 10) { console.log("That is a long word!"); }

Question 33

What does else do?

Answer 33

For an if statement an else outputs a given output if the condition being closeted by the if is false.

Question 34

How do you use substring?

Answer 34

Substring coordinates work like this. (1,4) The 1 means to start counting on the 2nd character of the string and the 4 means to count 4 characters from that point. Ex: "Batman".substring(0,3); Would be "Bat".