fabric.js/src/util/lang_string.js

if (!String.prototype.trim) {
  /**
   * Trims a string (removing whitespace from the beginning and the end)
   * @method trim
   * @see <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Trim">String#trim on MDN</a>
   */
  String.prototype.trim = function () {
    // this trim is not fully ES3 or ES5 compliant, but it should cover most cases for now
    return this.replace(/^[\s\xA0]+/, '').replace(/[\s\xA0]+$/, '');
  };
}

/**
 * Camelizes a string
 * @memberOf fabric.util.string
 * @method camelize
 * @param {String} string String to camelize
 * @return {String} Camelized version of a string
 */
function camelize(string) {
  return string.replace(/-+(.)?/g, function(match, character) {
    return character ? character.toUpperCase() : '';
  });
}

/**
 * Capitalizes a string
 * @memberOf fabric.util.string
 * @method capitalize
 * @param {String} string String to capitalize
 * @return {String} Capitalized version of a string
 */
function capitalize(string) {
  return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
}

/** @namespace */
fabric.util.string = {
  camelize: camelize,
  capitalize: capitalize
};