How to eliminate subdomains from a string using TypeScript

Question

How to eliminate subdomains from a string using TypeScript

I am working with a string in TypeScript that follows the format subdomain.domain.com. My goal is to extract just the domain part of the string. For example, subdomain.domain.com should become domain.com.

It's important to note that the 'subdomain' section of the URL can vary in size, so it could be 'subdomain.domain.com' or 'sub.domain.com'. Similarly, the domain itself may differ, such as 'subdomain.domain.com' or 'subdomain.new-domain.com'.

In order to achieve this, I need to remove everything up to and including the first '.' in the string. I hope that clarifies things!

javascript string typescript

Answer 1

Answer №1

let domainName = 'website.test.com';

let reversedCharacters = domainName.split('').reverse();
let reversedDomain = '', dotCounter = 0;

do {
    if (reversedCharacters[0] === '.') {
        dotCounter++;
        if (dotCounter == 2) break;
    }
    reversedDomain += reversedCharacters[0];
    reversedCharacters.splice(0, 1);
} while (dotCounter < 2 && reversedCharacters.length > 0);

let rootDomain = reversedDomain.split('').reverse().join('');

This code snippet removes subdomains from a domain name and returns the root domain.

Answer 2

let domainName = 'website.test.com';

let reversedCharacters = domainName.split('').reverse();
let reversedDomain = '', dotCounter = 0;

do {
    if (reversedCharacters[0] === '.') {
        dotCounter++;
        if (dotCounter == 2) break;
    }
    reversedDomain += reversedCharacters[0];
    reversedCharacters.splice(0, 1);
} while (dotCounter < 2 && reversedCharacters.length > 0);

let rootDomain = reversedDomain.split('').reverse().join('');

This code snippet removes subdomains from a domain name and returns the root domain.

Answer 3

Answer №2

To extract the last 2 elements of a URL and combine them into a new string, you can split the URL by '.' and then manipulate the resulting array accordingly.

function extractDomain(url: string) {
    const segments = url.split('.');
    const lastTwo = segments.slice(-2).join('.');
    
    try {
        // Check if it's a valid URL with a protocol
        const instance = new URL(url);
        return `${instance.protocol}//${lastTwo}`;
    } catch (_) {
        return lastTwo;
    }
}

extractDomain('https://subdomain.example.com') // https://example.com
extractDomain('subdomain.example.com') // example.com
extractDomain('https://subdomain.another-subdomain.example.com') // https://example.com

Answer 4

To extract the last 2 elements of a URL and combine them into a new string, you can split the URL by '.' and then manipulate the resulting array accordingly.

function extractDomain(url: string) {
    const segments = url.split('.');
    const lastTwo = segments.slice(-2).join('.');
    
    try {
        // Check if it's a valid URL with a protocol
        const instance = new URL(url);
        return `${instance.protocol}//${lastTwo}`;
    } catch (_) {
        return lastTwo;
    }
}

extractDomain('https://subdomain.example.com') // https://example.com
extractDomain('subdomain.example.com') // example.com
extractDomain('https://subdomain.another-subdomain.example.com') // https://example.com

How to eliminate subdomains from a string using TypeScript

Answer №1

Answer №2

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