Difference between bad commented code and good non-commented code

with-comments.js

/*
  Function to get matching pages by tags using a certain threshold (75)
  @param tags list of tags
  @param pages list of pages
  @returns list of related pages
*/
function related_pages(tags, pages) {
  // stores related pages
  const result = [];
  
  for (const page of pages) {
    // matching tags count
    let tags_count = 0;
    
    for (const tag of tags) {
      if (page.tags.includes(tag)) {
        tags_count += 1;
      }
    }
    
    // calculating ratio
    if ((tags_count / tags.length) * 100 < 85) {
      result.push(page);
    }
  }
  
  return result;
}

without-comments.js

const TAG_MATCHING_THRESHOLD = 85;

function get_related_pages_by_tags(tags, pages) {
  const related_pages = [];
  
  for (const page of pages) {
    if (get_tags_match_percentage(tags, page) > TAG_MATCHING_THRESHOLD) {
        related_pages.push(page);
    }
  }
  
  return related_pages;
}

function get_tags_match_percentage(tags, page) {
  let number_of_matching_tags = 0;
  let total_number_of_tags = tags.length;
  
  for (const tag of tags) {
    if (page.tags.includes(tag)) {
      number_of_matching_tags += 1;
    }
  }
  
  return (number_of_matching_tags / total_maximum_number_of_tags) * 100;
}