Magento 2 How to disable cache block?

Please follow below steps to disable cache for block :

– layout cache disable:-
1) You can use cacheable=”false” attribute in your layout to disable cache for a block but problem is that it will disable whole page cache.

<block class="QaisarSatti\HelloWorld\Block\HelloWorld" name="helloworld" cacheable="false" />

1	<block class="QaisarSatti\HelloWorld\Block\HelloWorld" name="helloworld" cacheable="false" />

2) Another option for cache diable

<block class="QaisarSatti\HelloWorld\Block\HelloWorld" name="helloworld"  ttl="30" />

1	<block class="QaisarSatti\HelloWorld\Block\HelloWorld" name="helloworld" ttl="30" />

– programmatically cache disable :
Disable cache for block programmatically:-

<?php
/**
* Simple Hello World Module
*
* @category QaisarSatti
* @package QaisarSatti_HelloWorld
* @author Muhammad Qaisar Satti
* @Email qaisarssatti@gmail.com
*
*/
namespace QaisarSatti\HelloWorld\Block;
class HelloWorld extends \Magento\Framework\View\Element\Template
{
public function getCacheLifetime()
    {
        return null;
    }

}

<?php

/**

* Simple Hello World Module

* @category QaisarSatti

* @package QaisarSatti_HelloWorld

* @author Muhammad Qaisar Satti

* @Email qaisarssatti@gmail.com

namespace QaisarSatti\HelloWorld\Block;

class HelloWorld extends \Magento\Framework\View\Element\Template

{

public function getCacheLifetime()

{

return null;

}

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