facebookLikesSystem.js

function facebookLikesSystem(names) {

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

console.log(facebookLikesSystem([])); // 'no one likes this'
console.log(facebookLikesSystem(['Peter'])); // 'Peter likes this'
console.log(facebookLikesSystem(['Jacob', 'Alex'])); // 'Jacob and Alex like this'
console.log(facebookLikesSystem(['Max', 'John', 'Mark'])); // 'Max, John and Mark like this'
console.log(facebookLikesSystem(['Alex', 'Jacob', 'Mark', 'Max'])); // 'Alex, Jacob and 2 others like this'