How to check If Customer is Logged In or Not Magento 2?

Method 1. To check the customer is logged or not on any page of the website:

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();

$customerSession = $objectManager->get('Magento\Customer\Model\Session');

if($customerSession->isLoggedIn()) {

   // customer login action

}

Method 2.  To check if customer is logged from controller:

$this->_objectManager->get('Magento\Customer\Model\Session');

if($customerSession->isLoggedIn()) {

   // customer login action

}

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