Daily Challenge #48 - Facebook Likes

ul, ol { 
  display: block;
  list-style: none;
  padding-left: 0;
  clear: both;
  height: 40px;
  line-height: 40px;
  counter-reset: people -2;
}

li {
  display: inline-block;
  float: left;
  font-size: 1rem;
  counter-increment: people;
}

/* empty list */
ul:empty::before,
ol:empty::before {
  content: "No one likes this post.";
}

/* one element only */
li:first-child:last-child::after {
  content: " likes this post.";
}

/* separate all names by commas */
li:not(:first-child)::before {
  content: ", ";
}

/* the last name (or from the third one) will end the list */
li:nth-child(n + 3)::before,
li:last-child:not(:first-child)::before {
  content: "\00a0 and ";
}

/* add message for multiple names */
li:nth-child(n+3)::after,
li:last-child::after {
  content: " like this post.";
}

/* from the 4th element forth, they must be hidden */
li:nth-child(n+3):not(:last-child) {
  font-size: 0;
}

/* the last element in a list of 4 or more is special */
li:nth-child(n+4):last-child::before {
  font-size: 1rem;
  content: "\00a0 and " counter(people) " others like this post.";
}
li:nth-child(n+4):last-child {
  font-size: 0;
}
li:nth-child(n+4):last-child::after {
  content: "";
}

likes :: [String] -> String
likes []        = "no one likes this"
likes [a]       = a ++ " likes this"
likes [a, b]    = a ++ " and " ++ b ++ " like this"
likes [a, b, c] = a ++ ", " ++ b ++ " and " ++ c ++ " like this"
likes (a:b:xs)  = a ++ ", " ++ b ++ " and " ++ (show $ length xs) ++ " others like this"

def likes(ls)
  case ls
  in []
    "no one likes this"
  in [a]
    format "%s likes this", a
  in [a, b]
    format "%s and %s like this", a, b
  in [a, b, c]
    format "%s, %s and %s like this", a, b, c
  in [a, b, *rest]
    format "%s, %s and %d others like this", a, b, rest.size
  end
end

p likes([]) # => "no one likes this"
p likes(["Peter"]) # => "Peter likes this"
p likes(["Jacob", "Alex"]) # => "Jacob and Alex like this"
p likes(["Max", "John", "Mark"]) # => "Max, John and Mark like this"
p likes(["Alex", "Jacob", "Mark", "Max"]) # => "Alex, Jacob and 2 others like this"

const likes = names => {
  switch(names.length) {
    case 0:
      return "no one likes this"
    case 1:
      return `${names[0]} likes this`
    case 2:
      return `${names[0]} and ${names[1]} like this`
    case 3:
      return `${names[0]}, ${names[1]} and ${names[2]} like this`
    default:
      return `${names[0]}, ${names[1]} and ${names.length - 2} others like this`
  }
}

const likeText = (likes = []) => {
    if(!likes.length) return 'no one likes this';

    const [first, second, third, ...rest] = likes
    if(!second) return `${first} likes this`;
    if(!third) return `${first} and ${second} like this`;
    if(!rest.length) return `${first}, ${second} and ${third} like this`;
    return `${first}, ${second} and ${rest.length + 1} others like this`;
}

fn fb_likes(names: &[&str]) -> String {
    match names.len() {
        0 => "no one likes this".to_string(),
        1 => format!("{} likes this", names[0]),
        2 => format!("{} and {} like this", names[0], names[1]),
        3 => format!("{}, {} and {} like this", names[0], names[1], names[2]),
        _ => format!(
            "{}, {} and {} others like this",
            names[0],
            names[1],
            names.len() - 2
        ),
    }
}

f=(n)=>(b=n.length<2,a=new Intl.ListFormat`en-GB`,(n.length>3?a.format([n[0],n[1],n.length-2+' others']):a.format(n.length?n:['no one']))+` like${b?'s':''} this`)

f([])
"no one likes this"
f(["Peter"])
"Peter likes this"
f(["Jacob", "Alex"])
"Jacob and Alex like this"
f(["Max", "John", "Mark"])
"Max, John and Mark like this"
f(["Alex", "Jacob", "Mark", "Max"])
"Alex, Jacob and 2 others like this"

fun void likes(string array[]) {
  array.size() => const int sz;
  switch(sz) {
    case 0:
      <<< "no one", " likes this" >>>;
      break;
    case 1:
      <<< array[0], " likes this" >>>;
      break;
    case 2:
      <<< array[0], " and ", array[1], " like this" >>>;
      break;
    case 3:
      <<< array[0], ", ", array[1], " and ", array[2], " like this" >>>;
      break;
    default:
      <<< array[0], ", ", array[1], " and ", sz -2, " others", " like this" >>>;
      break;
  }
}

[ "Peter" ] => likes;
[ "Jacob", "Alex" ] => likes;
[ "Max", "John", "Mark" ] => likes;
[ "Alex", "Jacob", "Mark", "Max" ] => likes;

function likes(people) {
  switch (people.length) {
    case 0:
      return 'no one likes this';
    case 1:
      return `${people[0]} likes this`;
    case 2:
      return `${people[0]} and ${people[1]} like this`;
    case 3:
      return `${people[0]}, ${people[1]} and ${people[2]} like this`;
    default:
      return `${people[0]}, ${people[1]} and ${people.length - 2} others like this`;
  }
}

$likes = ["Alex", "John", "Jeremiah", "David", "Travis"];
$message = "";
switch ($likes){
    case (!isset($likes)):
        $message = "no one likes this";
    break;
    case (sizeof($likes) == 1):
        $message = "$likes[0] likes this";
    break;
    case (sizeof($likes) == 2):
        $message = "$likes[0] and $likes[1] like this";
    break;
    case (sizeof($likes) == 3):
        $message = "$likes[0], $likes[1] and $likes[2] like this";
    break;
    case (sizeof($likes) > 3):
        $message = "$likes[0], $likes[1] and ". ( sizeof($likes) - 2 ) . " others like this";
    break;
    default: 
        $message = "no one likes this";
}
echo $message;