NoSQL Node JS nodejs

 

MERN is a full stack, following the traditional three-tier architectural pattern, including the front-end display tier (React.js), application tier (Express.js and Node.js), and database tier (MongoDB).

Sequelize - A NodeJS ORM

NodeJS: Node.js is an open-source, cross-platform JavaScript runtime environment.

Angular / angular

ngAngular

 

this.newFramework = ""; // empty string

if (this.newFramework) 

{

                                                                console.log("This will not be logged.");

}

- **If `this.newFramework` is null, undefined, an empty string, 0, or NaN**: The condition evaluates to `false`, and the code inside the `if` block is not executed. - **If `this.newFramework` is a non-empty string, a non-zero number, an object, or any other truthy value**: The condition evaluates to `true`, and the code inside the `if` block is executed.

- **`localStorage` does not automatically clear its contents when the browser is closed.

** Data persists until explicitly removed. - If you want data to be cleared when the browser or tab is closed, use **`sessionStorage`**, which only retains data for the duration of the session

// Storing a value

localStorage.setItem('username', 'john_doe');

// Retrieving a value

const username = localStorage.getItem('username');

console.log(username); // Output: john_doe

// Removing a value

localStorage.removeItem('username');

// Trying to retrieve the value again

const removedUsername = localStorage.getItem('username');

console.log(removedUsername); // Output: null