finding the word at a position in javascript

Question

For string input of \'this is a sentence\' it must return \'is\' when position is 6 or 7. When position is 0, 1, 2, 3 or 4 result must be \'this\'.

What is the easie

Answer 1

function getWordAt(s, pos) {
  // make pos point to a character of the word
  while (s[pos] == " ") pos--;
  // find the space before that word
  // (add 1 to be at the begining of that word)
  // (note that it works even if there is no space before that word)
  pos = s.lastIndexOf(" ", pos) + 1;
  // find the end of the word
  var end = s.indexOf(" ", pos);
  if (end == -1) end = s.length; // set to length if it was the last word
  // return the result
  return s.substring(pos, end);
}
getWordAt("this is a sentence", 4);