src/language/LanguageManager.js
function _validateNonEmptyString(value, description, deferred) {
        var reportError = deferred ? deferred.reject : console.error;

        // http://stackoverflow.com/questions/1303646/check-whether-variable-is-number-or-string-in-javascript
        if (Object.prototype.toString.call(value) !== "[object String]") {
            reportError(description + " must be a string");
            return false;
        }
        if (value === "") {
            reportError(description + " must not be empty");
            return false;
        }
        return true;
    }
function _validateNonEmptyString(value, description, deferred) {
        var reportError = deferred ? deferred.reject : console.error;

        // http://stackoverflow.com/questions/1303646/check-whether-variable-is-number-or-string-in-javascript
        if (Object.prototype.toString.call(value) !== "[object String]") {
            reportError(description + " must be a string");
            return false;
        }
        if (value === "") {
            reportError(description + " must not be empty");
            return false;
        }
        return true;
    }
function _validateNonEmptyString ( value , description , deferred ) { var reportError = deferred ? deferred . reject : console . error ; // http://stackoverflow.com/questions/1303646/check-whether-variable-is-number-or-string-in-javascript if ( Object . prototype . toString . call ( value ) !== "[object String]" ) { reportError ( description + " must be a string" ) ; return false ; } if ( value === "" ) { reportError ( description + " must not be empty" ) ; return false ; } return true ; }
Helper functions 
Checks whether value is a non-empty string. Reports an error otherwise.
If no deferred is passed, console.error is called.
Otherwise the deferred is rejected with the error message.
@param {*}                value         The value to validate
@param {!string}          description   A helpful identifier for value
@param {?jQuery.Deferred} deferred      A deferred to reject with the error message in case of an error
@return {boolean} True if the value is a non-empty string, false otherwise
Helper functions Checks whether value is a non - empty string . Reports an error otherwise . If no deferred is passed console . error is called . Otherwise the deferred is rejected with the error message .