'use strict';

// This is a comment

/*
   This is a comment
   on multiple lines
*/

// VARIABLES
//
// A variable is a symbol that represents a quantity that may vary.
//
// $identifier = value;

var age = 25;  // The value 25 is assigned to variable age



// BASIC DATA TYPES
var age = 25;                            // Integer
var temperature = -3.82;                 // Real number
var name = 'Nacho López';                // String
var has_car = true;                      // Boolean (only two values: true or false)



// ARITHMETIC OPERATIONS WITH NUMBERS
var x = 5;
var y = 2;

var z = x + y;   // Addition.                                     Result: 7.
z = x - y;       // Subtraction.                                  Result: 3.
z = x * y;       // Multiplication.                               Result: 10.
z = x / y;       // Division.                                     Result: 2.5.
z = x % y;       // Modulo (remainder of the integer division).   Result: 1.

z++;             // Increase the value of z by 1.                 Result: 2.
z--;             // Decrease the value of z by 1.                 Result: 1.

z = 50 - x * 6 / -0.5;        //
z = (50 - x) * 6 / -0.5;      // The order of operations is as in mathematics
z = (50 - x * 6) / -0.5;      //

z = 2 * z + 3;                // Remember: the symbol = assigns a value to the variable



// BASIC OPERATIONS WITH STRINGS
var a = 'GNU/';
var b = 'Linux';
var c = a + b;          // Concatenation                          Result: 'GNU/Linux'.
c = a.repeat(3);        // Repetition                             Result: 'GNU/GNU/GNU/'.



// PRINT VARIABLES ON CONSOLE

console.log('Hello, world!');           // Prints on console: Hello, world!
console.log(x);                         // Prints the variable x

// You can print on console strings and variables
console.log('I have bought', x, 'oranges and', y, 'lemons.');



// DATA TYPE CONVERSION

var height = '95.4';
console.log(typeof(height));                // Prints the current data type
height = Number(height);                    // Convert a string to a real number
console.log(typeof(height));

var altitude = -544.432;
console.log(typeof(altitude));
altitude = String(altitude);                // Convert a real number to string
console.log(typeof(altitude));



@@ -277,59 +277,8 @@
 PES%0A
-var age = 25;                            // Integer
 %0Avar
@@ -322,14 +322,9 @@
  // 
-Real n
+N
 umbe

Update 01.js