Filtro que trunca uma string e adiciona uma string no final (por default sendo '...')

truncate.filter.js

// ########################################################################### //
// ########################################################################### //
//                                  - Truncate -                               //
// ########################################################################### //
// ########################################################################### //
/**
 * Truncate Filter
 * @Param text
 * @Param length, default is 10
 * @Param end, default is "..."
 * @return string
 */
/**
 * Usage
 *
 * var myText = "This is an example.";
 *
 * {{myText|truncate}}
 * {{myText|truncate:5}}
 * {{myText|truncate:25:" ->"}}
 * Output
 * "This is..."
 * "Th..."
 * "This is an e ->"
 *
 */

define(
    [
        'app',	
    ],
    function(app) {
        app
            .lazy
            .filter('truncate', function () {
                return function (text, length, end) {
                    if(text == null)
                        return '';

                    if (isNaN(length))
                        length = 10;

                    if (end === undefined)
                        end = "...";

                    if (text.length <= length || text.length - end.length <= length) {
                        return text;
                    } else {
                        return String(text).substring(0, length-end.length) + end;
                    }
                };
            });
    }
);