Stockholm Syndrome

let elem = document.body.removeChild(child);
document.body.appendChild(elem);

items.forEach((item) => {
  item.parent_id.forEach((id) => {
    let elem = items.find((item) => item.id === id);
    (elem.children = elem.children || []).push(item);
  });
  item.children = item.children || [];
});

Function.prototype.bind = function(context, ...args) {
  let object = {...context};
  let symbol = Symbol('target');
  object[symbol] = this;
  return function(...rest) {
    return object[symbol](...args, ...rest);
  };
};

postHTTP(url, info) {
  return new Promise((resolve, reject) => {
    this.http.post(url, info, httpOptions).subscribe((data) => {
      resolve(data);
      console.log("POST Request is successful ", data);
    }, (error) => {
      reject(error);
      console.log("Error", error);
    });
  });
}

function VK(access_token, options) {
  function vk() {
    ...
  }

  vk.on = ... 
  vk.longpoll = ...

  return vk;
}

function cuteArr(arr, value) {
  let a = arr.indexOf(value); 
  if (a !== -1) {
    arr.splice(a, 1); 
    return arr;
  }
}

function shieldingRegExp(str, flags) {
  return new RegExp(str.replace(/(\[|\\|\^|\$|\||\?|\*|\+|\(|\)|\.)/g, '\\$1'), flags);
}

index = tags_json[c].search(shieldingRegExp(tags, 'gi'));

{
  "response": {
    "count": 3,
    "items": [5485951, 84317567, 997521] 
  }
}