0xD34F

попытался решить все через рекурсию

const createTree = (data, idKey, parentKey, parentId) =>
  data.reduce((acc, n) => (parentId === n[parentKey] && acc.push({
    ...n,
    children: createTree(data, idKey, parentKey, n[idKey]),
  }), acc), []);


const tree = createTree(data, 'id', 'parentId', null);

function createTree(data, idKey, parentKey) {
  const tree = Object.fromEntries(data.map(n => [ n[idKey], { ...n, children: [] } ]));

  return Object
    .values(tree)
    .filter(n => !(tree[n[parentKey]] && tree[n[parentKey]].children.push(n)));
}


const tree = createTree(data, 'id', 'parentId');

передавать параметры <...> оставив в computed

methods: {
  filterHeroes(attr) {
    const s = this.searchHeroesString.toLowerCase();
    return this.heroes.filter(n => n.hero_attribute === attr && n.name.toLowerCase().includes(s));
  },

data: () => ({
  active: false,
}),
created() {
  const onClick = e => this.active = this.$refs.block.contains(e.target) && this.active;
  document.addEventListener('click', onClick);
  this.$on('hook:beforeDestroy', () => document.removeEventListener('click', onClick));
},

<button @click.stop="active = !active">click me</button>
<div :class="{ active }" ref="block">hello, world!!</div>

state: {
  opened: null,
  ...

toggleNav(state, block) {
  state.opened = state.opened === block ? null : block;
},

closeSidebarPanel(state) {
  state.opened = null;
},

isPanelOpen(state) {
  return !!state.opened;
},

<span v-if="isPanelOpen">{{ $store.state.opened.bName }}</span>

<template #default="{ block }">
  <div class="sidebar-panel-settings">
    <div class="setting-block">
      {{ block.bName }}
    </div>
  </div>
</template>

array.reduceRight((acc, n) => ({ ...n, children: [ ...n.children, acc ] }), { ...obj })

<img src={this.props.items[this.state.image].img} />

const isEmpty = [...inputs].some(n => !n.value);

// или

const isEmpty = !Array.prototype.every.call(inputs, n => n.value);

// или

let isEmpty = false;
for (const n of inputs) {
  if (!n.value) {
    isEmpty = true;
    break;
  }
}

// или

let isEmpty = false;
for (let i = -1; ++i < inputs.length && !(isEmpty = !inputs[i].value);) ;

// или

const isEmpty = (function isEmpty(i) {
  return i < inputs.length && (!inputs[i].value || isEmpty(-~i));
})(0);

const grouped = Object.entries(list.reduce((acc, n) => (
  (acc[n.part] = acc[n.part] || []).push(n.title),
  acc
), {}));

document.body.insertAdjacentHTML('beforeend', grouped
  .map(([ k, v ]) => `<div>${k}</div>${v.map(n => `<div>${n}</div>`).join('')}`)
  .join('')
);

document.body.append(...grouped.flat(2).map(n => {
  const div = document.createElement('div');
  div.innerText = n;
  return div;
}));

$(ids.map(n => `[data-property-id-row="${n}"]`).join(', ')).hide();

const elems = document.querySelectorAll(ids.map(n => `[data-property-id-row="${n}"]`));
for (let i = 0; i < elems.length; i++) {
  elems[i].style.display = 'none';
}

document.querySelectorAll('.form-group').forEach(function(n) {
  n.hidden = this.has(Number(n.getAttribute('data-property-id-row')));
}, new Set(ids));

.hidden {
  display: none;
}

for (const n of document.getElementsByClassName('form-group')) {
  n.classList.toggle('hidden', ids.includes(+n.dataset.propertyIdRow));
}

<select v-model="selected">
  <option v-for="n in deliveryPrice" :value="n">{{ n.city }}</option>
</select>

<div v-if="selected">
  <div>{{ selected.city }}</div>
  <div>{{ selected.priceFrom }}</div>
</div>

<select v-model="city">
  <option v-for="n in deliveryPrice">{{ n.city }}</option>
</select>

computed: {
  selected() {
    return this.deliveryPrice.find(n => n.city === this.city);
  },
},

<select v-model="selectedIndex">
  <option v-for="(n, i) in deliveryPrice" :value="i">{{ n.city }}</option>
</select>

data: () => ({
  selectedIndex: -1,
}),

computed: {
  selected() {
    return this.deliveryPrice[this.selectedIndex];
  },
},

let index = -1;
setInterval(() => {
  index = (index + 1) % array.length;
  console.log(array[index]);
}, 500);

Показалось будет неудобно юзать в Вью компоненте. Мне надо при наведении мышки показывать по кругу картинки из массива и останавливать при убирании мышки.

<div
  @mouseenter="установитьИнтервал"
  @mouseleave="сброситьИнтервал"
>

methods: {
  установитьИнтервал() {
    this.interval = setInterval(() => { ... }, 666);
  },
  сброситьИнтервал() {
    clearInterval(this.interval);
  },
},

function App() {
  const [ values, setValues ] = useState(Array(10).fill(''));

  const onChange = ({ target: t }) => {
    const index = +t.dataset.index;
    const value = t.value;

    setValues(values.map((n, i) => i === index ? value : n));

    if (index < values.length - 1 && value) {
      inputRefs.current[index + 1].focus();
      inputRefs.current[index + 1].select();
    }
  };

  const inputRefs = useRef([]);

  return (
    <div>
      {values.map((n, i) => (
        <div>
          <input
            value={n}
            data-index={i}
            onChange={onChange}
            ref={input => inputRefs.current[i] = input}
            maxLength="1"
          />
        </div>
      ))}
    </div>
  );
}

$("#changeCityInput").bind("keyup change",

const getNestedData = (data, condition) => Object
  .values(data instanceof Object ? data : {})
  .reduce((acc, n) => (
    acc.push(...getNestedData(n, condition)),
    acc
  ), condition(data) ? [ data ] : []);


const objects = getNestedData(data, x => x && x.value > 0);

const checked = Array.from(document.querySelectorAll('.btn:checked'), n => n.value);
const filtered = arr.filter(n => checked.includes(n));