This code is inspired from ShaveJS and uses that approach in one line.

First of all, here's the code in one line.

const shave=(s, n)=>(s.length>n) ? s.substr(0, n-2)+'..' : s;

This function takes two parameters, string and length. Then truncates (or shaves) the string to that length with ellipsis at end.

Now for readability, more elaborated version.

function shave(string, length){
    return (string.length>length) ? string.substr(0, n-2)+'..' : string;
}

Psst. this is also used in this blog and length of text is 100 characters (yep, I counted).

See you later or maybe on Twitter