solotimes

var s = 'this-is-a-very-very-very-long-file-name.jpg';

console.log(truncate(s, 100)); //this-is-a-very-very-very-long-file-name.jpg
console.log(truncate(s, 10)); //this-is-a-[...].jpg
console.log(truncate(s, 4)); //this[...].jpg