How to transform tags to lowercase and sort alphabetically?

[wcDogg]

Hello and thanks for a great project !

I'm using the getAllTags and filterTagList filters and they work as expected. However, I would like to:

1. Transform all tags to lower case to reduce Output Conflict from tags like Javascript, JavaScript, and javascript.
2. Sort tags alphabetically for usability.

I stink at JS and after several hours of trying, I must admit defeat. Any guidance would be much appreciated :)

[wcDogg]

Got a working answer from Stack Overflow. Here is the modified filter:

eleventyConfig.addFilter("getAllTags", collection => {
  let tagSet = new Set();
  for(let item of collection) {
    (item.data.tags || []).forEach(tag => tagSet.add(tag.toLowerCase()));
  }
  return Array.from(tagSet).sort();
});