flash.moe/assets/makai.js/utility.js

const $i = document.getElementById.bind(document);
const $c = document.getElementsByClassName.bind(document);
const $q = document.querySelector.bind(document);
const $qa = document.querySelectorAll.bind(document);

const $r = function(element) {
    if(element && element.parentNode)
        element.parentNode.removeChild(element);
};

const $ri = function(name) {
    $r($i(name));
};

const $ib = function(ref, elem) {
    ref.parentNode.insertBefore(elem, ref);
};

const $rc = function(element) {
    while(element.lastChild)
        element.removeChild(element.lastChild);
};

const $rp = function(target, replace) {
    $ib(target, replace);
    $r(target);
};

const $ar = function(array, index) {
    array.splice(index, 1);
};
const $ari = function(array, item) {
    let index;
    while(array.length > 0 && (index = array.indexOf(item)) >= 0)
        $ar(array, index);
};
const $arf = function(array, predicate) {
    let index;
    while(array.length > 0 && (index = array.findIndex(predicate)) >= 0)
        $ar(array, index);
};

const $as = function(array) {
    if(array.length < 2)
        return;

    for(let i = array.length - 1; i > 0; --i) {
        let j = Math.floor(Math.random() * (i + 1)),
            tmp = array[i];
        array[i] = array[j];
        array[j] = tmp;
    }
};

const $csrfp = (function() {
    const elem = $q('meta[name="csrfp-token"]');

    return {
        get: () => elem?.content ?? '',
        set: token => {
            if(elem != null)
                elem.content = token?.toString() ?? '';
        },
    };
})();