How to create newsletter subscriber programmatically magento2

Question

How to create newsletter subscriber programmatically ? I have email id I want to save that email id in newsletter subscriber how can I do that ?

<?php

/**
 * Copyright 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace vendorname\moduelname\Model;

use Sapient\CustomApi\Api\CustomInterface;

/**
 * Defines the implementaiton class of the calculator service contract.
 */
class Custom implements CustomInterface
{

    protected $subscriberFactory;


    public function __construct(

    \Magento\Newsletter\Model\SubscriberFactory $subscriberFactory
) {
    $this->subscriberFactory= $subscriberFactory;

}
    /**
     * Return the sum of the two numbers.
     *
     * @api
     * @param int $num1 Left hand operand.
     * @param int $num2 Right hand operand.
     * @return int The sum of the two values.
     */
    public function add($num1, $num2) {
        return $num1 + $num2;
    }

    /**
     * Sum an array of numbers.
     *
     * @api
     * @param string[] $email The array of numbers to sum.
     * @return string The sum of the numbers.
     */
    public function newsletter($email) {

           //$data ="sssssssss"; 
          // print_r($data);
           //die;
        $this->subscriberFactory->create()->subscribe($email);
        return $email;
    }
}

Answer 1

To do that you can inject Magento\Newsletter\Model\SubscriberFactory in your constructor:

protected $subscriberFactory;

public function __construct(
    //
    \Magento\Newsletter\Model\SubscriberFactory $subscriberFactory,
) {
    $this->subscriberFactory= $subscriberFactory;
    //
}

Then in your code you can call:

$this->subscriberFactory->create()->subscribe($email);

Answer 2

$email = 'test_email@gmail.com';
$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
$subscriber= $objectManager->create('Magento\Newsletter\Model\SubscriberFactory'); 
$subscriber->create()->subscribe($email);

Answer 3

From Magento 2.4, store_id has to be provided. You have to use SubscriptionManagerInterface class.

use Magento\Newsletter\Model\SubscriptionManagerInterface;

/**
 * @var SubscriptionManagerInterface
 */
private SubscriptionManagerInterface $subscriptionManager;

/* @param SubscriptionManagerInterface $subscriptionManager */
public function __construct(
    SubscriptionManagerInterface $subscriptionManager
) 
{
    $this->subscriptionManager= $subscriptionManager;
}

And then in your function:

$this->subscriptionManager->subscribeCustomer((int)$customer->getId(), (int)$storeId);