lesson 2 codecademy

Question 1

variable

Answer 1

A variable can be thought of as a label that points to the location of a specific piece of data. Variables are not the values that is stored inside of them

Question 2

Data Types

Answer 2

the classifications we give to the different kinds of data that we use in programming. In JavaScript, there are seven fundamental data types:
Number, String, Boolean, Null, Undefined, Symbol, and Object

Question 3

Number

Answer 3

any number, including numbers with decimals

Question 4

String

Answer 4

any grouping of characters on your keyboard surrounded by single quotes or double quotes, though we prefer single quotes.

Question 5

Boolean

Answer 5

This data type only has two possible values: true or false. It’s helpful to think of booleans as on and off switches.

Question 6

Null

Answer 6

represents the intentional absence of a value, and is represented by the keyword null.

Question 7

Undefined

Answer 7

represents the absence of a value though it has a different use than null. undefined means that a given value does not exist

Question 8

Symbol

Answer 8

a newer feature to the language, symbols are unique identifiers, useful in more complex coding,

Question 9

Object

Answer 9

Collections of related data.

Question 10

Arithmetic Operators

Answer 10

An operator is a character that performs a task in our code. They allow us to perform mathematical calculations on numbers.

Question 11

String Concatenation

Answer 11

The process of appending one string to another.
ex: console.log(‘hi’+’ya’); //Prints ‘hiya’

Question 12

Properties

Answer 12

All data types have access to specific properties that are passed down to each instance. You can retrieve property information by appending the string with a period and the property name
ex: Every string instance has a property called length that stores the number of characters in that string. console.log(‘Hello’.length); //Prints 5

Question 13

Methods

Answer 13

actions we can perform. Data types have access to specific methods that allow us to handle instances of that data type.

Question 14

The rules for naming variables

Answer 14

Variable names cannot start with numbers.
Variable names are case sensitive, so myName and myname would be different variables.
Variable names cannot be the same as keywords.

Question 15

An if statement

Answer 15

checks a condition and will execute a task if that condition evaluates to true.

Question 16

if.. else statements

Answer 16

make binary decisions and execute different code blocks based on a provided condition.

Question 17

else if statements

Answer 17

gives us the ability to add more conditions