Stockholm Syndrome

document.querySelector('#firstElem').childNodes.forEach((n) => n.nodeType === document.TEXT_NODE && n.remove());

const user_balance = () => {
  return new Promise((resolve, reject) => {
    Wallet.getBalance((err, balance) => {
      if (err) {
        reject(err); 
      } else {
        const data = balance.accounts[0].balance.amount;
        resolve(data);
      }
    });
  });
}


user_balance()
  .then((data) => {
    console.log(data);
  }).catch((err) => {
    console.error(err);
  });

const attachType = 'photo'; 

obj.attachType // вернёт obj.attachType
obj[attachType] // вернёт obj.photo

const attachments = content.attachments
  .map((o) => `${o.type}${o[o.type].owner_id}_${o[o.type].id}`)
  .join(',');

$('.wrap .item').each(function(i) {
  $(this).attr('data-index', i);
});

class SomeClass {
  callbacks = []; 

  
  on(eventType, cb) {
    this.callbacks.push({
      type: eventType, 
      callback: cb
    });
  }


  emit(type, ...args) {
    this.callbacks
      .filter((n) => n.type === type)
      .forEach((n) => n.callback.call(this, ...args));
  }
}

const traversal = (arr, prevKey, key) => arr.map((o) => {
  const newObj = {
    ...o, 
    [key]: o[prevKey], 
    children: traversal(o.children, prevKey, key)
  }; 
  delete newObj[prevKey];
  return newObj;
});

const newArr = traversal(data, 'name', 'key');

const gallerySlider = new Swiper(galleryBoxSlider, {
  effect: 'fade',
  speed: 1000,
  simulateTouch: false
});

return {
  ...state,
  articles: state.articles.map(({comments, ...o}) => ({
    ...o, 
    comments: comments.filter((c) => c.id !== action.id)
  }))
};

$("#ddd").html("привет");
// или
document.getElementById("#ddd").innerHTML = "привет";

$('#second-check').change(function() {
  const href = $(this).prop('checked') ? 
    'https://google.com/' :
    'https://youtube.com/';
  
  $('a').attr('href', href);
});