export function parse_option(a,b){return"undefined"==typeof a?b:a}export function create_object_array(a){const b=Array(a);for(let c=0;c<a;c++)b[c]=create_object();return b}export function create_arrays(a){const b=Array(a);for(let c=0;c<a;c++)b[c]=[];return b}export function get_keys(a){return Object.keys(a)}export function create_object(){return Object.create(null)}export function concat(a){return[].concat.apply([],a)}export function sort_by_length_down(c,a){return a.length-c.length}export function is_array(a){return a.constructor===Array}export function is_string(a){return"string"==typeof a}export function is_object(a){return"object"==typeof a}export function is_function(a){return"function"==typeof a}