Shopify - Getting minimum and maximum price for variants in product. Found out product already has attribute for min and max. This can be used for custom function.

shopify-collection-product.liquid

{% comment %}
  {% assign price_min = 0 %}
  {% assign price_max = 0 %}
  {% for variant in product.variants %}
    {% if price_min == 0 or price_max == 0 %}
      {% assign price_min = variant.price %}
      {% assign price_max = variant.price %}
    {% endif %}
    {% if price_min > variant.price %}
      {% assign price_min = variant.price %}
    {% elsif price_max < variant.price %}
      {% assign price_max = variant.price %}
    {% endif %}
  {% endfor %}
{% endcomment %}

<strong>{{ product.price_max | money }} - {{ product.price_min | money }}</strong>