Javascript Basics & Flow Control

Question 1

What are the five primitive data types?

Answer 1

1. Numbers
2. Strings
3. Booleans
4. Undefined
5. Null

Question 2

What is a Modulo/Mod?

Answer 2

A “%” sign

52 % 5

=2

Question 3

What is concatenations?

Answer 3

When two stings are added together!

“Aaron” + “ Scott”

or

“Aaron” + “ “ + “Scott”

Question 4

How do you open the JavaScript Console in Chrome

Answer 4

Control + Shift + J

Command + Shift + J

Question 5

What does a “" do in JS strings?

Answer 5

Allows you to see invisible items if placed directly before/after

‘what/’s up?’

=what’s up?

Question 6

What type of case is JS?

Answer 6

camelCase

Question 7

How do you comment out in JS

Answer 7

//

Question 8

What is Ampersand

Answer 8

&&

Question 9

What is Ampersand Ampersand?

Answer 9

&& = And

Question 10

What is the pipe?

Answer 10

|| = or

Question 11

What is the bang?

Answer 11

! = Not

Question 12

What 6 things are falsey?

Answer 12

1. False
2. 0
3. Empty String or “”
4. Undefined
5. Null
6. NaN

Question 13

What is Dry?

Answer 13

Do not repeat yourself

Question 14

<=

Answer 14

Less then or equal to

Question 15

how do you write does not equal?

Answer 15

!=

Question 16

== vs ===

Answer 16

== uses type coecrion

(Makes the two types the same)

===

(Must be the same type, and same value)

Question 17

if

else if

else

(Define)

Answer 17

Use if to specify a block of code to be executed, if a specified condition is true

Use else if to specify a new condition to test, if the first condition is false

Use else to specify a block of code to be executed, if the same condition is false

Question 18

The only thing that’s built in to JS that in capital is…

Answer 18

Methods

Question 19

if

else if

else

(Example)

Answer 19

if (time < 10) {
greeting = “Good morning”;
} else if (time < 20) {
greeting = “Good day”;
} else {
greeting = “Good evening”;
}

Question 20

What does unit+=5 mean?

Answer 20

Unit+5

Question 21

What does Unit++ mean?

Answer 21

Add 1

Question 22

While loop

(Define)

Answer 22

The while loop loops through a block of code as long as a specified condition is true.

Question 23

While Loop

(Syntax)

Answer 23

Syntax

while (condition) {
code block to be executed

}

Question 24

For Loop Defined… & Syntax

Answer 24

Define

The for statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement (usually a block statement) to be executed in the loop.

Syntax

for(init; condition; step){

}

Question 25

Example of for loop

Answer 25

for(i = 5; i < 50; i++)
{
if(i % 5===0 && i % 3===0){
console.log(i)
}
}