How to apply an existing coupon code programmatically in Magento 2

I try to apply an existing coupon code programmatically in a controller by coupon id.

The only thing I found these code lines for Magento 1.


Does anyone know how can I do this in magento 2?


Use Checkout model session to get quote data.

 /** @var \Magento\Checkout\Model\Session $checkoutSession**/


Remember to inject \Magento\Checkout\Model\Session in your constructor.

Take a look: vendor/magento/module-checkout/Controller/Cart/CouponPost.php

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