Question 1:

String.prototype.removedVowels = function(){ return this.replace(/[ueoaiUEOAI]/g, '');}
// Test:
"This website is for losers LOL!".removedVowels();

Question 2:

The current code is using callback and it is easy to fall to "Callback Hell". 
To optimize this code, we can use Async/await

module.exports = {
	getAccountId: async (apiKey, cb) => {
		try{
			const connection = await sql.connect(connectionString);
			result1 = await connection.query(query1);
			console.log(result1);
			result2 = await connection.query(query2, {...result1});
			console.log(result2);
			result3 = await connection.query(query3, {...result2});
			console.log(result3);
		catch(ex){
			console.error(ex);
		}
	}
}

MarvelManager

Demo: https://marvel-manager-40bc5.firebaseapp.com

This project was generated with Angular CLI version 7.3.7.

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Code scaffolding

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.

Build

Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the --prod flag for a production build.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via Protractor.

Further help

To get more help on the Angular CLI use ng help or go check out the Angular CLI README.