ToShortDescription

by merganser

JavaScript

function ToShortDescription(str, numberOfWords) {
  var words = str.split(' ');
  words.splice(numberOfWords, words.length-1);
  return words.join(' ') + 
    (words.length !== str.split(' ').length ? '...' : '');
}

var sentence = "This is a long sentence!";

console.log(ToShortDescription(sentence, 2));