function evaluateStringConcat(lhs, rhs) {
        var result;

        var lstr = '';
        var rstr = '';
        if (typeof lhs !== 'undefined') {
            lstr = fn.string(lhs);
        }
        if (typeof rhs !== 'undefined') {
            rstr = fn.string(rhs);
        }

        result = lstr.concat(rstr);
        return result;
    }
Evaluate string concatenation against input data
@param {Object} lhs - LHS value
@param {Object} rhs - RHS value
@returns {string|*} Concatenated string