/* String: Any form of text */
/*Object: Stores a lot of key value pairs*/

/* declaring variables */

var  myName = "Beau"
/*can be used throughout program*/

myName = 8

let ourName = "freeCodeCamp"
/* may only be used within scope of where you declare that*/

const pi = 3.14
/*can never change*/

var a;
/* declaring a variable, called a */

var b =2;
/*declaring a, assigning 2*/

a = 7;
/* a has already been declared*/

b = a;
/* you have assigned contents of a to b*/

/*initializing a variable to an inital value at the same time it's declared*/
var a =9;
/* a: declare, 9: initizing*/

/* adding/subtracting numbers */
var sum = 10 + 10;
console.log(sum)

var difference = 20 - 10;

var product = 8 * 10;

var quotient = 66/2;

/*Incrementing numbers*/
/* refers to adding 1 to it*/

var myVar = 81;

myVar = myVar + 1;

/*or*/

myVar++;

/*decrementing numbers*/
/* minus 1 to it*/

var dcVar = 11;

dcVar = dcVar - 1;

/*or*/

dcVar--;

/*decimal numbers*/

var myDecimal = 5.7;

var secondDecimal = 0.0007;

/*Multiplying decimals*/

var product = 2.0 * 2.5;
console.log(product)

/*Dividing decimals*/

var quotient = 6.4/2.0;

/*finding the remainder*/
var remainder;
remainder = 11 % 3;

1821

////////
Variables are used to store data temporarily

- Data is stored somewhere, and give that memory location a name

- With this name, you may read the data and at a given location

A variable = box

What's inside the box = Value that we assign to variable (data)

Strings are a sequence of characters.



Rules of naming variables

- Do not use prexisting keywords used already
- Meaningful, should be clear instead of a1, b and c
- cannot start with a number (1name etc)
- cannot contain space or hyphen (-)
- case sensitive

To declare multiple variables

let firstName = "NumberOne";
let lastName = "NumberTwo";


value of variables (let) can change, but
the value of a constant cannot.


If you don't need to reassign, constant should be used.
If you do, use let

undefined: if value is not initalized, by default, its value is undefined
null is used to clear value of variable