findEmailDomain.js

// An email address such as "John.Smith@example.com" is made up of a local part ("John.Smith"), 
// an "@" symbol, then a domain part ("example.com").
// The domain name part of an email address may only consist of letters, digits, hyphens and dots. 
// The local part, however, also allows a lot of different special characters. 
// Here you can look at several examples of correct and incorrect email addresses.
// Given a valid email address, find its domain part.
// Example
// For address = "prettyandsimple@example.com", the output should be findEmailDomain(address) = "example.com";
// For address = "<>[]:,;@"!#$%&*+-/=?^_{}| ~.a"@example.org", the output should be findEmailDomain(address) = "example.org".

const findEmailDomain = address => {

    return address.slice(address.lastIndexOf('@') + 1)
}

console.log(findEmailDomain('prettyandsimple@example.com'));
console.log(findEmailDomain('<>[]:,;@\"!#$%&*+-/=?^_{}| ~.a\"@example.org'));