Example for Closure, .call, .apply in javascript

function add(y,z){ 
function fn(x,y,z){ 
console.log(Math.round(x+y)*z);
};
fn(this.x,y,z);
};

add.call({x: 20.1},3.1,5.1);  // 117.3
add.apply({x: 20.1},[3.1,5.1]);  // 117.3

Couple of interview questions

Write a function that takes an integer (i) and prints out the first 'i' rows of Pascal's Triangle (eg. i =5).

            line = 5;
            var pascalDepth = parseInt(line, 10); //The input integer is provided on a single line as a text value, so this handles it.
            var testTriangle = pascalTriangle(pascalDepth);
            var output = [];
            maxlength = testTriangle.length;
            var html = "<table>"
            for(var i = 0; i < maxlength; i++){
                html += "<tr>";
                html += "<td>";
                html += testTriangle[i];
                html += "</td>";
                html += "</tr>";
            }
            html+= "</table>";

            document.write(html);

            function pascalTriangle(totalLines, triangle) {
                if (typeof triangle === 'undefined') {
                    triangle = [];
                }

                if (triangle.length === totalLines) {
                    return triangle;
                }

                if (triangle.length > 0) {
                    var triangleLine = [];
                    for (var i = 0; i < triangle.length; i++) {
                        if (typeof triangle[triangle.length - 1][i - 1] === 'undefined') {
                            triangleLine.push(1);
                        } else {
                            triangleLine.push((triangle[triangle.length - 1][i - 1] + triangle[triangle.length - 1][i]));
                        }
                    }
                    triangleLine.push(1);
                    triangle.push(triangleLine);
                } else {
                    triangle.push([1]);
                }
                return pascalTriangle(totalLines, triangle);
            }
-----------------------------------------------------------------------------------------

Write a function that prints out a breakdown of an integer into a sum of numbers that have just one non-zero digit.  

eg., given 43018 it should print 40000 + 3000 + 10 + 8.

            var arr = [];
            var i =1;               
            var a = 40118;
            var input = 40118;
            while(a > 0)
            {
            if(a%(Math.pow(10,i)) > 0)
              arr.push(a%(Math.pow(10,i)));       
             
              a = a-a%(Math.pow(10,i++));
            }
            arr.sort(function(a,b){ return b-a;});
            document.write(input +" = " +arr.join(" + "));

Swap 2 numbers without using third variable

This is a very very very simple question generally asked as first level of logical questions

Swap 2 numbers without using third variable


function fnSwap(a,b){
   console.log("Initial value of a: "+ a);
   console.log("Initial value of b: "+ b);

   // swaping the values of a and b
    b = a+b
    a = b-a
    b = b-a
    console.log("Swaped value of a: "+ a);
   console.log("Swaped value of b: "+ b);
}

Input:

fnSwap(10,20);


output:

Initial value of a: 10

Initial value of b: 20

Swaped value of a: 20

Swaped value of b: 10

Note:
It works with console if you are working with firefox install firebug to see output in console
if you install chrome/IE you can use f12 for console

Create QR code generator using php-curl

    $url = "https://chart.googleapis.com/chart?";
    $strPost = "cht=qr&chs=177x177&chl=http://opendummies.blogspot.in/";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    // curl_setopt($ch, CURLOPT_PROXY, $proxy);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_HTTPGET,1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: image/jpeg"));
    curl_setopt($ch, CURLOPT_HEADER, FALSE);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $strPost); // add POST fields
    curl_setopt($ch, CURLOPT_POST, 1);
    header('Content-Type: image/jpeg');
    echo $result = curl_exec($ch);
    curl_close($ch);
    

output:

Google shorten URL - a Simple CURL script

$url = "https://www.googleapis.com/urlshortener/v1/url";     $strPost = '{"longUrl": "YOUR LONG URL"}';       $ch = curl_init();     curl_setopt($ch, CURLOPT_URL, $url);     //if your are using proxy url use proxy setting     // curl_setopt($ch, CURLOPT_PROXY, $proxy);     curl_setopt($ch, CURLOPT_HEADER, 1);     curl_setopt($ch, CURLOPT_HTTPGET,1);     curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);     curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/json")); //since i am requesting json response     curl_setopt($ch, CURLOPT_HEADER, FALSE);     curl_setopt($ch, CURLOPT_POSTFIELDS, $strPost); // add POST fields     curl_setopt($ch, CURLOPT_POST, 1);     $result = curl_exec($ch);     var_dump($result);     curl_close($ch);     exit; If you dont want to use the google url shortner want to create your own check it here : http://opendummies.blogspot.in/2014/07/creating-url-shortner.html

How to create a facebook add friend request

Using JavaScript :
 Things Required all u need to do i call

1. Call FB.init Method -
   

   FB.init({  appId  : 'YOUR_APP_ID',  frictionlessRequests : true });

2. To send request for purticular friends
1. function sendRequestToRecipients(){ FB.ui ({method: 'apprequests', message: 'My Request', to: '12345,23456' }, requestCallback); }

1.  To send request for all friends

1. function sendRequestViaMultiFriendSelector() {
     FB.ui({method: 'apprequests',
       message: 'My  Request'
     }, callbackfunction());
   }

    callbackfunction(response){

    alert(response);

   }

  

Create a Date Drop down

Creating a Date year and Date drop down which is validated based on leap year and date 

Here is the code please add jquery script tag before you include the code


 function fnDate(){
try{
for(var i=1950;i<=2009;i++){
jq("#dobyy").append("<option value="+i+">"+i+"</option>");
}
for(var i=1;i<=12;i++){
jq("#dobmm").append("<option value="+i+">"+i+"</option>");
}

var month = '';
var year = '';
jq("#dobmm").change(function(){
month = jq("#dobmm").val();
year = jq("#dobyy").val();
var aOddMnth = ["1","3","5","7","8","10","12"];
var aEvnMnth = ["4","6","9","11"];
jq("#dobdd").html("<select name=\"dobdd\" id=\"dobdd\" title=\"1\" style=\"width:84px;\"><option value=\"\">Day</option></select>&nbsp;&nbsp;&nbsp;&nbsp;");
if(month > 0){
if(month == "2"){
if(year%4 == 0){
for(var i=1;i<=29;i++){
jq("#dobdd").append("<option value="+i+">"+i+"</option>");
}
}else{
for(var i=1;i<=28;i++){
jq("#dobdd").append("<option value="+i+">"+i+"</option>");
}
}
}
if(jq.inArray(month,aOddMnth) != -1){
for(var i=1;i<=31;i++){
jq("#dobdd").append("<option value="+i+">"+i+"</option>");
}
}
if(jq.inArray(month,aEvnMnth) != -1){
for(var i=1;i<=30;i++){
jq("#dobdd").append("<option value="+i+">"+i+"</option>");
}
}
}
});
}catch(e){
alert(e.message)
}
}

A simple Shopping Cart code in PHP

Here is a simple way to code to code the shopping cart i have seen in many websites for the code but i hope i have done using basic simple concepts of PHP to code the Shopping cart

Here is the link to download the source code - download

Instructions for using that code

1. Extract the ca.rar
2. place ca folder in www folder
3. Execute the backup file or use scripts present in dbscripts folder to create new tables
4. Now run localhost/ca to execute the code 

 

Get Url From Browser in Php

Getting the URL  from the parent window when you use a popup. This small Example code might help you to get the url from the parent window this can be used normal windows also

 if(isset($_SERVER['HTTP_REFERER']))
{
   
    $strPrevScheme = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_SCHEME);
 

    $strPrevHost = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);
 

    $strPrevPath = parse_url($_SERVER['HTTP_REFERER'], PHP_URL_PATH);
 

    $strPrevURL = urlencode($strPrevScheme.'://'.$strPrevHost.$strPrevPath);
   
   
}

the parse_url(url) gives the following array 

Array
(
    [scheme] => http
    [host] => hostname
    [user] => username
    [pass] => password
    [path] => /path
    [query] => arg=value
    [fragment] => anchor
)

reference - http://in2.php.net/manual/en/function.parse-url.php 

Finding the Count of all Charecters entered

<?php
/******************************************************************************
 * Filename: totalnumberofalphabets.php
 * Description: The file is used to count the number of occurences of each charecter
 * Author: G Jayendra Kartheek
 * Date Created: 26 Mar 2012
 * Copyright © 2012 All rights reserved
 ******************************************************************************/

//after user submits the values
if (isset($_POST['butSubmit']) && '' != $_POST['butSubmit']) {

    //taking the charecter into the array
    $strValue = str_split($_POST['txtInput']);
    //copying the string array
    $strDuplicate = $strValue;
   
    $iIntI = 0;
    //based on the string length travesing the array
    while ($iIntI < strlen($_POST['txtInput'])) {
        //initializing the count and j for every iteration
        $iCount = 0;
        $iIntIIntJ = 0;
        //comparing each and every element  and finding the count of each element
        while ($iIntIIntJ < strlen($_POST['txtInput'])) {
            if ($strDuplicate[$iIntI] == $strValue[$iIntIIntJ]) {

                $iCount++;
            }
            $iIntIIntJ++;
        }
        //printing the count
        echo '<br>Number of times "' . $strDuplicate[$iIntI] . '" repeated is : ' . $iCount;
        $iIntI++;
    }
}
?>
<form name="" method ="POST">
    <input type='text' name = 'txtInput'/><input type = 'submit' name= 'butSubmit' value ="OK"/>
</FORM>

Closing the PopUp and redirecting Parent Window

I have tried for few hours to solve this problem Here is the simple example which helps you to solve the Problem

Problem:
 Create a PopUp window on submission of a value in PopUp the PopUp Closes and the Parent Windows redirects to Some other Page 

Solution:
Here is the simple way to solve it

Create 2 php pages

1. popup.php
Copy this Code

<html>
    <head>    
    </head>
    <body>
        <a href="#" onclick="window.open('popupcode.php','Login','height=500,width=420,scrollbars=yes');return false;">PopUp</a>
    </body>
    </html>

Count Number of tables in a Schema

This is a very Simple query to find the number of tables present in a purticular schema of the database


select information_schema as your default schema and use the following query to find the count of number of tables in a particular schema


SELECT count(*) FROM 'TABLES' WHERE TABLE_SCHEMA = 'YOUR_SCHEMA_NAME*'



*YOUR_SCHEMA_NAME = NAME OF THE SCHEMA TO WHICH YOU ARE FINDING THE COUNT

Switch Off Foreign Key Constraint

I used to use this code regularly but when i found it for the first time it took me to read many pages to read after getting the code i thought this would be useful for all people like me who want to Switch off the Foreign key Constraint in their tables

This is helpful when you are actually want to create tables irrespective of the Foreign key constraint 

To Turn Off - SET FOREIGN_KEY_CHECKS = 0;

To Turn On - SET FOREIGN_KEY_CHECKS = 1;

OAuth 2.0

Now its time to Switch on the easier and secured version of OAuth Protocol OAuth 2.0 so here is the presentation i have made which makes u people easy to understand the Protocol and important points to have talk to the server 


Presentation  - Download 




The presentation is based on the Oauth 2.0 written by the developers of Microsoft and Facebook on January 2012

Difference between Echo and Print in Php

We have Echo we have print in php which we use to display the output to the user

Both Echo and Print does the same work - Displaying the output on the screen

But there are couple of differences between them

Echo

1. Output one or more strings
2. Allows More parameters works only with the short open tags
3. It is not a function
   
4. It takes less memory
   

Print

1. Output only one string
2. It allows only one parameter
   
3. Its not a real function but its a language construct
4. It take a little more memory than echo
   

Train Seating Arrangement

I have refered many sites to get this searting arrangement this is almost common in all Indian Trains

Please click Download to get he seating arrangement

Curl Using PHP in a Gist

cURL: It is  a client that deals with URL so its named as cURL so as to say that it deals with URL only 

It is used to make client communicate with the server using command line 
arguments using cURL syntax

Its main use is to provide security to the URL's sent through the browser to the server
 
 The main commands in cURL  which i found is important are


1. curl_init() - with which the main curl operation starts

2.curl_setop($charecter,options,value) - 


                    $charecter = curl handle returned by curl_initi()

           options = curl provides various options with general syntax 

curlOPT_XXX 

                         other options are found in - PHP website

          value = value of the url

3. curl_exec() - which is used to execute a $charecter in which the information has be moved 

4.curl_close() - this is used to close the curl connection

          

Connect With Facebook API in Simple 7 Steps

Here is the presentation or Document Where i have described Simple 7 Steps To Connect to Facebook this can be used to any Social Networking Site

Download the Presentation From this Link ---- Download

Simple Script to Share your site in different Social Networks

A simple Script used to share your Website on Different Social Networks Replace your Wesite in the my Blog URL Place

OAuth Protocol

Implementation of OAuth protocol 

Information of OAuth protocol in a gist 

Clearly explained in the Following Presentation

PPT - Link

Document - Link