ARRAYS

Creating Arrays

var singleValue;
singleValue = 99;

var multipleValues = [];

multipleValues[0] = 50;
multipleValues[1] = 60;
mulitpleValues[2] = "Mouse";

console.log(multipleValues[2]); //  Mouse

// There is a short-hand

var multipleValues = [ 50,60,"Mouse" ];
//                    [0][1] [2]



var multipleValues = []; // an empty array

var multipleValues = new Array();   // Arrays are objects

var multipleValues = Array(); 

// Create an array with a size:

var multipleValues = Array(5);


// II. ARRAY PROPERTIES:

var multipleValues = [10,20,30,40,50];

// Array's have properties, like the .length property
console.log(multipleValues.length); //  Length = 5.


// III. ARRAY METHODS: 

someFuntion(params)l // to call a function

//methods are functions that belond to an object
someObject.someMethod(); // to call a method

var multipleValues = [10,20,30,40,50];

var reversedValues = multipleValues.reverse();
                                      .join();
                                      .sort();

console.log( reversedValues.join() ); //    "50,40,30,20,10"


// IV. ARRAYS ARE EVERYWHERE:

// A Real-World Example:

// There may come a time when you want to write a line of javascript that will say:

// "I want to know how many anchor tags exist on the page, how many links do I have"
// or how many h3's do I have?
// or how many img's do I have?
// paragraphs? 
// Etc...

var myArrayOfLinks = document.getElementsByTagName("a"); // How many anchor tags on the page?

// RETURNS: 

    /*              myArrayOfLinks
                [0] <a href="somepage...
                [1] <a href="otherpage...
                [2] <a href="http://...
                [3] <a href="http://...
    
    */