How check if product exist in cart in shopify?

@lindsey.homenick 

You can check if a product exists in the cart in Shopify by using Shopify Liquid code.

1. Open the cart.liquid template file in your Shopify theme editor.
2. Use the "for" loop to iterate through all items in the cart.
3. Use an "if" statement to check if the current item in the loop matches the product you are looking for.
4. If the product exists in the cart, you can then display a message or perform any other actions as needed.

Here is an example code snippet to check if a specific product exists in the cart:

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{% for item in cart.items %}
  {% if item.product.title == 'Product Title' %}
    <p>The product is already in the cart</p>
  {% endif %}
{% endfor %}

Replace 'Product Title' with the title of the product you are looking for. This code will loop through all items in the cart and check if the product title matches the one you specified. If a match is found, it will display a message indicating that the product is already in the cart.