Javascript Basics, Javascript

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const maxHealth = 100;
var currentHealth = 50;
var numberLives = 5;
currentHealth = maxHealth;
var characterName = "Wishmaster";
var currentLevel = 1;

//var isGameOver = false;
//print(isGameOver);
// const (value that can't be changed, let (scope base), var
//if (true) {
 //var isGameOver = false;   //var and const can be access inside and outside of code blocks
 //let isGameOver = false;
//}

let message = "Hi, my name is " + characterName; //"Hi, my name is ${characterName}"; <-- Interpolation
let length = characterName.length;
let upperName = characterName.toUpperCase();
let lowerName = characterName.toLowerCase();
let wish = characterName.slice(0,4);
let level = "Hello, your current on level " + currentLevel; 
print(message)
print(wish)
print(level)

var inventory =["shirt", "axe", "bread", "shield"];
let shirt = inventory[0];
inventory[2] = "chicken";

inventory.length; // 4 items in array
inventory[0].length; // 5 characters in shirt

inventory.push("water"); // adds water on end of array
inventory.pop(); // remove last item

var levels = [ 
        [1.1, 1.2, 1.3], // row 1
        [2.1, 2.2, 2.3, 2.4], // row2
        [3.1, 3.2, 3.3], // row3
        [4.1, 4.2], // row4
];
var firstWorld = levels[0]; // 1.1, 1.2, 1.3
var firstLevel = levels[0][1]; // level 1.2
// firstLevel [0][1] = 1.4
levels [1].pop();
levels [3].push(4.3);

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