//choose the best for your solution
var myVariable = 22; //this can be a string or number. var is globally defined
let myVariable = 22; //this can be a string or number. let is block scoped
const myVariable = 22; //this can be a string or number. const is block scoped and can't be reassigned

//Assigns the value bar to the variable foo
var foo = bar;

//let and var are both editable variables and can be changed later on in your program;
let dog = 'Woof';
//dog is equal to the string 'Woof';
dog = false;
//You can changed the value of dog now because it was defined with let and not const;
let cow = 'Moo';
//cow is equal to the string 'Moo';
cow = true;
//You can change the value of cow later on because it is not defined with const;
//const is used when declaring a variable that can't be changed later on -- const stands for constant;
const pig = 'oink';
//This assigns the string 'oink' to pig which can not be changed because it is defined with const;
pig = 'snort';
//Above throws an error
//Good Job you now know how to declare variables using JavaScript!!!

// you an pass in strings or a number
var exampleVariable = 'Example string' // this is a normal string
var anotherExample = 839; 

let variableName = "value";

const name = 'Anthony';

// You can change the variable name and the value that i filled in. (witch is variable)
var variable = 47; // You can make this a string, a number, a boleean, an array and a object, but var is globally defined.
let variable = "a string" // As you can see i put a string and you can test it, it works. let is block scoped if you asked.
const variable = true // const is for if you want a variable not to change. So like pi if you made that a const or a variable (look at following example)
const pi = 3.14159265358979323846 // So now if you wish to add pi to calculate something you just type: "pi"

var myVar; //unitialized variable( can be intiallized later )
var number = 1; //number
var string = " hello world " ; //string
var boolean = true ; //boolean
myVar = function(){ //variable can hold function
};