Bulk unfollow people on LinkedIn

If you are using chrome go the page that shows who you are following (LinkedIn) and run this code in the chrome developer console. It will go and click the unfollow button for you. I had to scroll down on the page first so all the profiles would load before I ran the script.

var buttons = $("button"),
interval = setInterval(function(){
 var btn = $('.is-following');
    console.log("Clicking:", btn);
    btn.click();
    if (buttons.length === 0) {
     clearInterval(interval);
    }
}, 1000);

http URL not calling in Angular

Http uses rxjs and is a cold/lazy observable, meaning that you should subscribe to it to make it work.

  this.http.get(`http://swapi.co/api/people/1`).map((response:Response) => {
                console.log(response.json());
                response.json();
            }).subscribe();

Or if you want to subscribe from somewhere else , you should return the http.get method like this : :

 getAllPersons():Observable<any>{
    console.log("Here");
       return this.http.get(`http://swapi.co/api/people/1`).map((response:Response) => {
        console.log(response.json());
        response.json();
    });
    } 

and then :

   getAllPersons().subscribe();

building and Deploying Google Firebase cloud functions

https://firebase.google.com/docs/functions/get-started

$ firebase deploy --only functions

$ firebase deploy --only functions:addMessage

Cannot set variable of undefined

https://stackoverflow.com/questions/38807643/error-uncaught-in-promise-typeerror-cannot-set-property-isadmin-of-null

when variable not set in function "then" block, this doesnt work, need to a copy of "this" reference with in the calling function.

down voteaccepted

Either you can use arrow function firebase.database().ref('/userProfile/' + user.uid).once('value') .then((snapshot) => { or use var self = this; firebase.database().ref('/userProfile/' + user.uid).once('value') .then(function(snapshot) { self.isAdmin = true; otherwise this doesn't point to the current function when it's called. See also https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Functions/Arrow_functions

promise-polyfill error while using Firebase in Angular

ERROR in ./~/firebase/app/shared_promise.js

Module not found: Error: Can't resolve 'promise-polyfill'

Solution: 
npm install promise-polyfill --save-exact

continuous integration | angular cli + firebase + travis ci

https://houssein.me/continuous-integration-angular-firebase-travisci

Angular project with gitHub

http://developer.telerik.com/featured/quick-angular-2-hosting-angular-cli-github-pages/

Udemy course videos download

Courtesy: Pankaj Barnwal, Quora ( https://www.quora.com/How-do-I-download-videos-from-Udemy)

How to Download your subscribed course videos from Udemy:

If you don't mind getting your hand dirty in coding, may i suggest you a python script 'python-dl' which is best to download videos from the mentioned course site.

Step-by-step Guide -

if you dont have pip installer, have it installed via following command-

sudo apt install python-pip

Now download python script "python-dl" through pip install-

sudo pip install udemy-dl

Below is the command to download entire udemy course using this script

udemy-dl course-link

Next type your username & password and you will be good to go, or you can type them in the same sentence like this

udemy-dl -u username -p password course link

Advance Usage - This is where it gets fun. if you want to download specific video from the list, use following command -

udemy-dl -u username -p password --lecture-start lecture No where you want download to start --lecture-end end point

For Example -

udemy-dl -u abcd@xyz.com -p HND$#$5 --lecture-start 52 --lecture-end 58 https://www.udemy.com/COURSE_NAME

Note - This script does not pull written docs but it works great for videos.