Split string to two, will have almost same length

Question

I have string: \"This is a sample string\", and I need to split it to 2 strings, without break the words, and that the two strings will have the closest length, so the result wi

Answer 1

You can use indexOf with the second parameter as the half of the length of the string. By this, indexOf will search for the next index of matching string after the provided index.

Demo

var str = "Thisasdfasdfasdfasdfasdf is a sample string",
  len = str.length;

var ind = str.indexOf(' ', Math.floor(str.length / 2) - 1);
ind = ind > 0 ? ind : str.lastIndexOf(' ');

var str1 = str.substr(0, ind),
  str2 = str.substr(ind);

document.write(str1 + ' 
 ' + str2);

---

UPDATE

what if i will need to split it to 3 or 4 or whatever elements?

function split(str, noOfWords) {
  // Set no. of words to 2 by default when nothing is passed
  noOfWords = noOfWords || 2;

  var len = str.length; // String length
  wordLen = Math.floor(len / noOfWords); // Approx. no. of letters in each worrd

  var words = [],
    temp = '',
    counter = 0;

  // Split the string by space and iterate over it
  str.split(' ').forEach(function(v) {
    // Recalculate the new word length
    wordLen = Math.floor((len - words.join(' ').length) / (noOfWords - counter));

    // Check if word length exceeds
    if ((temp + v).length < wordLen) {
      temp += ' ' + v;
    } else {
      // Add words in the array
      words.push(temp.trim());

      // Increment counter, used for word length calculation
      counter++;
      temp = v;
    }
  });

  // For the last element
  temp.trim() && words.push(temp.trim());
  return words;
}

var str = "This is a sample string. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eos quae error ab praesentium, fugit expedita neque ex odio veritatis excepturi, iusto, cupiditate recusandae harum dicta dolore deleniti provident corporis adipisci.";

var words = split(str, 10);

console.log(words);
document.write('
' + JSON.stringify(words, 0, 2) + '
');