How to Link to Next and Previous Posts for Same Blog Category

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Here’s an alternate version of the Liquid code snippet above. It only iterates over the categories list once, and it exits as soon as it finds a match, so it should be substantially faster, in case you are not able to use the plugin. Note that in case of multiple categories for the post, this uses the first one.

{% assign cat = page.categories[0] %}
{% assign cat_list = site.categories[cat] %}
{% for post in cat_list %}
  {% if post.url == page.url %}
  	{% assign pOffset = forloop.index0 | minus: 1 %}
  	{% assign nOffset = pOffset | plus: 2 %}
  	{% if forloop.first == false %}
  	  {% assign next_post = cat_list[pOffset] %}
  	{% endif %}
  	{% if forloop.last == false %}
  	  {% assign previous_post = cat_list[nOffset] %}
  	{% endif %}
  	{% break %}
  {% endif %}
{% endfor %}
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