console.log();  
console.log("You can print strings");
console.log("You can print numbers:", x);
console.log("You can add tabs \t and \n new lines.");

let final_boss; 
let magic_number = 15;
let best_friend = "Mr. Squirrel"; 

// We need to declare the prompt function
const prompt = require("prompt-sync")();
// Then we can use it to get a STRING from standard input
let user_input = prompt("Some message here"); 

let length = "This is a string".length;
// or
let my_string_length = my_string.length;

let str = "76X";
str = Number(str);   // NaN - Not a Number
str = parseInt(str); // 76, it stops when it hits a character

// Another example (these both work)
let fake_number = "6";
fake_number = Number(fake_number);
fake_number = parseInt(fake_number);  

let my_string = "MiXed CASe STring";
let upper_string = my_string.toUpperCase();
let lower_string = my_string.toLowerCase();

// Using charAt()
let first_char = my_string.charAt(0);
// Using square-bracket indexes
let first_letter = my_string[0];
let last_letter = my_string[my_string.length - 1];

// Round to the nearest whole number
let rounded = Math.round(5.76);
// Round to one decimal
rounded = Math.round(5.76 * 10)/10;

// Get a random decimal number
let rnd = Math.random();

// Get PI to 9 decimals
let pi = Math.PI;

if (user_input == 20) {
  // Do some code
} else if (user_input > 20) {
  // Do something else
} else {
  // All other cases (less than 20 in this example)
}

user_input = parseInt(user_input);