How to call helper function observer in magento2

Question

I am trying to call helper function on observer custom module in Magento2 but Unable to call helper in observer.

Please help me if anybody have this solution. I am waiting for all your positive response.

Answer 1

Try something like below in your observer file.

<?php

namespace Custom\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

class SalableObserver implements ObserverInterface
{
    ...

    protected $dataHelper;

    ...

    public function __construct(
        ...
        \Custom\Module\Helper\Data $dataHelper
        ...
    ) {
        ...
        $this->dataHelper = $dataHelper;
        ...
    }

    public function ...(){
        $helper = $this->dataHelper;
    }

    ...
}

?>