Example javascript for private/public properties/functions

(function($) {
    /**
     * trim functions
     *
     * @class trim
     */
    function trim() {
        'use strict';

        /**
         * @type {number}
         * @private
         */
        var trimLength = 100;

        /**
         * @type {number}
         * @public
         */
        this.trimStart = 0;

        /**
         * crop each element with data-trim="true"
         *
         * @return {void}
         */
        this.start = function() {
            var $elements = getTrimElements();
            $elements.each(function() {
                var $this = $(this);
                var content = $this.html();

                // trim content
                $this.html(trim(content));

                // if changed content, add title attribute
                if ($this.html() !== $this.html(trim(content))) {
                    $this.prop('title', removeQuotes(content));
                }
            });
        };

        /**
         * @returns {*|HTMLElement}
         */
        var getTrimElements = function() {
            return $('*[data-trim="true"]');
        };

        /**
         * Trim string by 100 characters and append "..."
         *
         * @param string
         * @returns {*|string}
         */
        var trim = function(string) {
            if (string.length > trimLength) {
                return string.substr(this.trimStart, trimLength) + ' ...';
            }
            return string;
        };

        /**
         * remove quotes
         *
         * @param string
         * @returns {XML|void|*|string}
         */
        var removeQuotes = function(string) {
            return string.replace(/"/g, '');
        };
    }

    var trimClass = new trim();
    trimClass.start();
})(jQuery);