String truncation and trim methods

String-Truncate-Trim.js

if (typeof String.prototype.trimAll !== 'function') {
  String.prototype.trimAll = function() { /* Trim all whitespace from strings: */
    var sString = this;

    if (typeof(sString) === 'undefined' || (!sString)) return '';

    while(sString.substring(0,1) == ' ' || 
      sString.substring(0,1) == '\r' || 
      sString.substring(0,1) == '\n') {
      sString = sString.substring(1, sString.length);
    }

    while (sString.substring(sString.length-1, sString.length) == ' ' || 
      sString.substring(sString.length-1, sString.length) == '\r' || 
      sString.substring(sString.length-1, sString.length) == '\n') {
      sString = sString.substring(0,sString.length-1);
    }

    return sString;
  };
}

if (typeof String.prototype.truncate !== 'function') {
  String.prototype.truncate = function(n, useWordBoundary = true) { /* Truncate strings: */
    var tooLong = this.length > n;
    var s_ = tooLong ? this.substr(0, n - 1).trimAll() : this;
    s_ = useWordBoundary && tooLong ? s_.substr(0, s_.lastIndexOf(' ')) : s_;

    if (tooLong) {
      while (/[^A-Z]$/i.test(s_)) { 
        s_ = s_.substr(0, s_.length - 1); 
      }
    }

    return tooLong ? s_ + '...' : s_;
  };
}