//Javascript Tutorial

// Means Comment

/* hehhe
wow this is fun
i am dumb */

// Hello I 
// can 
// do this now

// variable (var): want to make a empty box called dog, but expecting sth in there later
// Can later assign Lucy to this box. variable originally empty box name is dog, but then the variable value is Lucy

var dog;
dog = "Buddy";
console.log(dog);
// var is the old name, it is a bad practice

//let: will change, e.g. box called cat but give it a different cat (value) every single time
let cat;
cat = "Tom";
console.log(cat);
cat = "John";
console.log(cat);

//const: constant, thing in box will never change
const bird = "sparrow";
console.log(bird);

//Data types: type of things u put in variable, e.g. tell box to put in specific type of value

//Primitives Data Types
//String, Number, Boolean, Undefined, Null

//String: anything in single or double quotation, can type anything, show direct thing in quotation
const funnystring = "John Doe";
console.log(funnystring);

//String concatenation
const name1 = "John";
const name2 = "Doe";
const fullName = `The full name is ${name1} ${name2}`;
console.log (fullName);
console.log ("The full name is" + name1 + " " + name2);

//String Escape Character, \ escapes the quotation
console.log ("Ronald said \"It'\s raining outside\"");

//String indexing: the computer recognizes it as each number assigned: every single letter on the word will have a index
const string = "javascript bob";
console.log(string[0]); //j
console.log(string[5]); 
console.log(string[11]);


// Number: just a number (both one with decimal or one without)
let age = 20;
console.log (age);
age = age + 15;
console.log (age)

//NaN: not a number
let result = "Hello"/2;
console.log(result);

//infinity
let infinity = 1/0
console.log(infinity)

//Boolean: true or false statements, all comparisons, !==" "
console.log (1>2);
console.log (5<7);
console.log ("tiffany" !== "Tiffany")

let tiffany = "tiffany" 
let haha = "Tiffany"
tiffany = haha
console.log (tiffany == haha)

//Undefined: did not give x anything
let x;
console.log(x);

//Null: telling them theres nothing in the code
let y = null;
console.log(y);