Top 20 Algorithms Every Programmer Should Know

 Searching

1. Linear Search

2. Binary Search

3. Breadth First Search (BFS)

4. Depth First Search (DFS)

Sorting

5. Merge Sort

6. Quick Sort

7. Insertion Sort 

8. Selection Sort 

9. Counting Sort 

10. Heap Sort

11. Topological Sort

12. Kahn’s Topological Sort

Arrays

13. KMP

14. Kadane’s 

15. Quickselect

16. Floyd’s Cycle Detection

17. Boyer–Moore Majority Vote

Basic Algo

18. Euclid’s

19. Union Find

20. Huffman Coding Compression

How to build an Angular 8 app from scratch in 11 easy steps

Step 1 — Installing Angular CLI 8

Step 2 — Creating your Angular 8 Project

Step 3 — Adding Angular HttpClient

Step 4 — Creating Components

Step 5 — Adding Routing

Step 6 — Building the UI with Angular Material Components

Step 7 — Mocking a REST API

Step 8 — Consuming the REST API with Angular HttpClient

Step 9 — Handling HTTP Errors

Step 10 — Adding Pagination

Step 11 — Building and Deploying your Angular Application to Firebase

Reff : https://www.freecodecamp.org/news/angular-8-tutorial-in-easy-steps/

Codeigniter URL Routing, Suffix & Enable Query String

Wildcards:

We can use two types of wildcards, namely:

1. :num –  Segment containing only numbers will be matched.
2. :any – Segment containing only characters will be matched.

$route['(blog/:num)'] = 'tutorial/java/$1';

$route['(blog/:any)'] = 'tutorial/java';

Regular Expression

$route['blog/([a-zA-Z0-9]+)'] = 'tutorial/java';

Reference : https://www.formget.com/routes-in-codeigniter

JQuery count number of divs with a certain class?

var numItems = $('.item').length;

Get all text field value located in a specific class

$(".test .text-field").each(function() {

    alert($(this).val());

});

Note : test and text-field is class of text field

Building a Video/Audio Chat Web App with WebRTC

https://web-engineering.info/node/57

https://github.com/dimircea/WebRTC


https://medium.com/@amirsanni/building-a-text-audio-and-video-chat-web-app-using-webrtc-and-ratchet-45863446e79a

https://github.com/amirsanni/Video-Call-App

https://subinsb.com/live-group-chat-with-php-jquery-websocket/

https://github.com/rdegges/chatapp

Remove Menu From Wordpress Admin

add_action('admin_init', 'remove_menu_from_admin');

function remove_menu_from_admin()
{ 
    // Remove unnecessary menus
    $menus_to_stay = array(
        // Job Listing
        'edit.php?post_type=job_listing',
    );
    foreach ($GLOBALS['menu'] as $key => $value) {         
        if (!in_array($value[2], $menus_to_stay)) remove_menu_page($value[2]);
    }
}

PHP Code to Remove Everything Except Number

$mobileNumber = "(111) 2568-5698";

preg_replace('/\D/', '', $mobileNumber);

OR,

preg_replace('/[^0-9]/', '', $mobileNumber);

Encrypt and Decrypt a PHP String

function decEnc($action, $string) {
$output = false;

$encrypt_method = "AES-256-CBC";
$secret_key = 'Secret key';
$secret_iv = 'Secret iv';

// hash
$key = hash('sha256', $secret_key);

// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);

if( $action == 'encrypt' ) {
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
$output = base64_encode($output);
}
else if( $action == 'decrypt' ){
$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
}

return $output;
}

Encryption Example:
$string = "hanzala";
decEnc("encrypt", $string);

Decryption  Example:
$string = "eU15RFhTZGN5SWJzTGgrRSs4SW9zQT09";
decEnc("decrypt", $string)

How to get the value of selected radio button in a group using jQuery

    $(document).ready(function(){
        $("input[type='button']").click(function(){
            var radioValue = $("input[name='gender']:checked").val();
            if(radioValue){
                alert("Your are a - " + radioValue);
            }
        });
       
    });