javascript Sort array

// IF variable is not defined (or has a falsey value) THEN set it to an empty object.
// ELSE do nothing (technically speaking, variable gets assigned to itself)
var variable = variable  ||  {} ;

function test(){
   console.log(1);
}
// when called
test(); // 1
// or
var a = test;
a(); // 1

// or autocall if code executed
var test2 = function(){
  console.log(2);
}
// test2 is undefined because the function test2 has no return value

// return string
function stringTest(param) {
    return 'Hello ' + ' ' + param;
}

console.log(stringTest("Alice"));  // Hello Alice

// return number
function numberTest(param) {
    return 6 + param;
}

console.log(numberTest(5));  // 11

// or autocall if code executed 
// function is like other variables
// parenthesis is for made groups or call functions.
// Immediately-Invoked Function Expression,
// or IIFE for short. It executes immediately after it’s created.
(function(){
  // all your code here
  var foo = function() {};
  window.onload = foo;
  // ...
})();

// foo is unreachable here (it’s undefined)

//////////////////////////////
// IIFE Immediately Invoked Funtion Expression
var greeting = function(name) {
    return 'Hello ' + ' ' + name;
}('John');

console.log(greeting);  // Hello John
console.log(typeof greeting);  // string
console.log(greeting('Suzan'));  // Uncaught TypeError: greeting is not a function


///////////////////////
var val = (function(){
     var a = 0;  // in the scope of this function
     return function(x){
         a += x;
         return a;
     };
})();

alert(val(10)); //10
alert(val(11)); //21

///////////////////////
// create the structure

var testHash = {
   a : 1,
   b : function(){
      console.log(4);
   },
   c: function(param){
	   var num = param +5;
	   return num;
   }
}
console.log(testHash.a); // 1
testHash.b(); // 4
testHash['b'](); // 4
testHash.c(7); // 12

/////////////////////////
// or function like class
function TestClass(n) {
    this.some_property = n;
    this.some_method = function() {
       console.log(this.some_property);
    };
}

var foo = new TestClass(3);
var bar = new TestClass(4);
foo.some_method(); // 3
bar.some_property += 2;
bar.some_method(); // 6
// console.log(some_property); // Uncaught ReferenceError: some_property is not defined

//////////////////////////
function Car(brand, year) {
	return {
		brand: brand,
		year: year
	}
}
var honda = Car("Honda", 1999); 
console.log(honda.brand); // Honda
console.log(honda.year);  // 1999 

honda.brand = "Honda new Generation";
honda.year = 2021; 
console.log(honda.brand); // Honda new Generation
console.log(honda.year); // 2021

var mazda = Car("Mazda",1987);
console.log(honda.brand); // Honda new Generation
console.log(mazda.brand); // Mazda

//////////////////////////////////////
// simplified code 

 var TEST_CLASS = TEST_CLASS || {};

TEST_CLASS.pokus = TEST_CLASS.pokus || (function() {
    // -------------------------------------------------------------------------
    // Private static variables and methods
    // -------------------------------------------------------------------------
    
    var privateStaticNumber = 5;
    var privateStaticString = "My privateStaticString: ";
    var privateStaticArray = [];

	function privateStaticMethod(){
		console.log('privateStaticMethod');
	}

	// CONSTRUCTOR CTOR
	return function(config) {
		 // ----- private variables -----

        var me = this,
        isPaused = false;
		this.privateStaticNumber = config.firstParam;
		this.privateStaticString = privateStaticString + config.secondParam; // += produce: undefined I am from secondParam
		this.privateStaticArray = config.thirtParam;
			
		// ----- private methods -----
        function getMode (mode, speed) {
			// document.getElementById(mode).addEventListener('click', function () { snakeSpeed = speed; });
		}
		
		// ----- public variables -----
        me.correct = 0;
        me.wrong = 0;
		
		// ----- public methods -----
        
        me.setString = function(val) {
            this.privateStaticString = val;
        };
        me.getString = function() {
            return this.privateStaticString;
        };
		me.publicMethod = function(param){
			console.log(param + ' from me.publicMethod()');
		};

	
	}; // end CTOR
})();
// end TEST_CLASS.pokus

var _me = _me || {};
var _me_test = new TEST_CLASS.pokus({firstParam:8, secondParam:" I am from secondParam", thirtParam:[1,3,9]});
// TEST_CLASS.pokus.privateStaticMethod(); // is not a function
// TEST_CLASS.pokus.publicMethod("Hola!"); // TEST_CLASS.pokus.publicMethod is not a function
// TEST_CLASS.publicMethod("Hola hej!"); // TEST_CLASS.publicMethod is not a function
 
// TEST_CLASS.pokus.publicMethod(" Hello!"); // is not a function
_me_test.publicMethod(" Hello!"); //  Hello! from me.publicMethod()
console.log( _me_test.getString()); // My privateStaticString:  I am from secondParam
console.log( _me_test.isPaused); // undefined
 

Jak zjistit v javascriptu zda objekt existuje

How test if an object exists undefined or null.

if (typeof OBJECT_NAME != "undefined") {
        //object exists ... execute code here.
}

// or best of use try catch
var nObject;
try{
    
     nObject = image.image; // is image.image object?

 }catch (e){
  alert(e.message.toString()); // e.message == 'undefined' is null or not an object
  return; // or continue if image.image is a object
 }
// you can test now nObject as typeof nObject
if(typeof nObject == 'string') // or others etc.
{
 // do something
}

// dont use this

if (OBJECT_NAME != null) {
        //if object dont exists will error
}

Javascript set style class Example code.

// source in tag style
  		.my_class {
  			cursor: pointer;
  			vertical-align: middle;
  			font-size: 100%;
  			height: 30px;
  			background-color: #FFFF00;
  			border-bottom: thin solid #D9D9D9;
  		}

// source in tag script
document.getElementById("id_of_element").className = "my_class";

// in body tag
<div id="id_of_element">Some text...</div>

How Copy a Text to Clipboard JavaScript for IE.

Jak kopírovat text do schránky pomocí javascript pro Internet Explorer.

  function ClipBoard()
{
// idText is ID some textarea with style display:none;
// idDivWithText is some div with text where will copied to 
// clipoboard
idText.innerText = idDivWithText.innerText;
Copied = idText.createTextRange();

Copied.execCommand("RemoveFormat");
Copied.execCommand("Copy");
}

Jak získat obsah určité složky příklad v php.

/*************************
 * vyhleda soubory s prislusnou koncovkou
 * a vrátí nejmladsi soubor 
 * $extension
 */ 
  function getFileFromDir($path, $extension)
  { // BEGIN function getFileFromDir
  	    $fileReturn; $z = 0;
    if (is_dir ($path)) {
       $dh = opendir($path); // or die (" Directory Open failed !");
       
       while ($file = readdir($dh)){
            //print $file.'<br />';          
          if (is_file($path.$file)) { 
            //print $file.'<br />';
            $ar = explode(".", $file);
            if (count($ar) > 1) { 
            	if (strtolower($ar[count($ar) - 1])  == $extension) { // "zip", "exe" or other extension
                 $fileReturn[$z][0] =  date ("Ymd", filemtime($path.$file));                 
                 $fileReturn[$z][1] = $file;
             	   $z++;
                //break;
              }
            }	
          }
        }

       closedir ($dh);
    }
    if ($fileReturn) { 
        sort($fileReturn);
        return $fileReturn[count($fileReturn) - 1][1];    	
    }

  } // END function getFileFromDir
  /***************************