1.2

Question 1

What are the six primitive data types?

Answer 1

Strings
Numbers
Booleans
Null 
Undefined 
Symbol

Question 2

String

Answer 2

Text that is generally wrapped in single or double quotes

Question 3

\

What is the backslash used for in a string?

Answer 3

If you wanted to include a double/single quote within a string.
It’s used to escape and tell Javascript that the quotes should be displayed as quotes

var escapeText = “He said: \”Yes!”\, that’s for sure.”;

Question 4

What does concatenation mean?

Answer 4

To combine strings

Use the + sign to join strings

Question 5

Integer

Answer 5

A number with no decimal points.

Everyday round numbers: 1, 5, 17, 5,394 etc

Question 6

A float

Answer 6

Anything that does have a decimal point with at least one number following the point

Question 7

Boolean

Answer 7

True or False

Question 8

Null

Answer 8

Indicated that the value has been set to be empty purposefully

Question 9

Undefined

Answer 9

Indicates that the value was never set

Question 10

Objects

Answer 10

Contains a set of key-value pairs.
Like an unordered list of data

var car = {
color: ‘red’,
mileage: 10
};

Question 11

Array

Answer 11

Ordered lists of data items.
Items inside done have keys.
Simply a list of data values

Question 12

Arrays are indicated by comma-separated values between square brackets. Just like with normal objects, you can either place all the values on the same line or give each of the values their own line:

Answer 12

var numberArray = [1, 2, 3];
// or
var numberArray2 = [
  1,
  2,
  3
];

Question 13

// array of strings

Answer 13

var foodArray = [‘pizza’, ‘tuna’, ‘apple’];

Question 14

// array of objects

Answer 14

var carArray = [
  { type: 'Bus', wheels: 4, color: 'blue'},
  { type: 'Sport', wheels: 4, color: 'red'}
];

Question 15

// array of arrays

Answer 15

var myCalculatorNumbers = [
  [1, 2, 3],
  [3, 4, 6],
  [7, 8, 9]
];