only js code needed

# Assignment 4 - JavaScript > Find Create an address book application using JavaScript (plus HTML and CSS). (Use plain JavaScript, no third party libraries!) The **required functionality** is the following: JS neede * Entries Entries have the following fields: name, telephone number, email - Individual entries must be represented as an Entry object - The contact list must be represented as an array of Entry objects - The application must be shipped with some sample initial data (meaning, with a non-empty address book) * Display a list of entries - Emails should be clickable links that open in the mail client * Add a search field to filter the list Only those entries are displayed that contain the searched string as part of the name, telephone, or emai Matching is case-insensitive * The user can delete existing entries - Ask for a confirmation before deleting the entry * The user can add new entries Perform input check - The name field must never be empty Either tel or email has to be filled in Email has to be a valid email Tel may contain only numbers and + - ( ) and space In addition, you need to implement **at least one extra feature** (of your choosing) from the following options * Allow the list to be sorted based on name, telephone, or email. The sorting criteria can be chosen from a s * Add a settings panel that is hidden by default and is shown by clicking a button or link. The user can cust for example, change the font family and size for the different fields (name, tel, email), from predefined lis * Allow for existing entries to be modified