0xD34F

const filterObject = (obj, values) =>
  Object.entries(obj).reduce((acc, [ k, v ]) => (
    values.indexOf(v) !== -1 && (acc[k] = v),
    acc
  ), {});


const result = filterObject(a, b);

const filterObject = (obj, filter) =>
  Object.fromEntries(Object.entries(obj).filter(n => filter(...n)));


const result = filterObject(a, (k, v) => b.includes(v));

return this.$store.authInfo

Объект FileReader позволяет веб-приложениям асинхронно читать содержимое файлов

onFileChange({ target: { files: [ file ] } }) {
  if (file) {
    const reader = new FileReader();
    reader.addEventListener('load', e => {
      this.fileinput = e.target.result;
      console.log(this.fileinput);
    });
    reader.readAsText(file);
  }
},

const flat = arr =>
  (arr || []).reduce((acc, { children, ...n }) => {
    if (n.isExpanded || !children) {
      acc.push(n, ...flat(children));
    } else {
      acc.push({ ...n, children });
    }

    return acc;
  }, []);

const flat = arr =>
  (arr || []).reduce((acc, { children, ...n }) => {
    const flatChildren = flat(children);

    if (n.isExpanded || !children) {
      acc.push(n, ...flatChildren);
    } else {
      acc.push({ ...n, children: flatChildren });
    }

    return acc;
  }, []);

:class="form.FirstName !== null ? form.FirstName ? 'input-successes' : 'input-error' : ''"

:class="{ 'input-successes': form.FirstName, 'input-error': form.FirstName === false }"

:class="form.FirstName !== null && [ 'input-error', 'input-successes' ][+form.FirstName]"

:class="({ true: 'input-successes', false: 'input-error' })[form.FirstName]"

this.update = () => {
  const
    w = this.w / 2,
    h = this.h / 2;

  this.x = Math.max(w, Math.min(W - w, this.x + this.dx));
  this.y = Math.max(h, Math.min(H - h, this.y + this.dy));
}

state = {
  likes: localStorage.getItem('likes') | 0,
}

plus = () => {
  this.setState(({ likes }) => ({
    likes: likes + 1,
  }), () => localStorage.setItem('likes', this.state.likes));
}

если в ней нет tr столбцов

for (const n of document.getElementsByTagName('table')) {
  n.hidden = !n.querySelector('tbody tr');
}

.hidden {
  display: none;
}

document.querySelectorAll('table').forEach(function(n) {
  n.classList.toggle('hidden', this(n.tBodies));
}, tBodies => Array.prototype.every.call(tBodies, n => !n.rows.length));

const attacks = [
  { minChance: 7, damage: 40, name: 'critical' },
  { minChance: 5, damage: 20, name: 'big' },
  { minChance: 0, damage: 10, name: 'weak' },
];

const messages = {
  start: (player, enemy) => `Welcome! Yor health is - ${player}%, your enemy health - ${enemy}%`,
  end: (player, enemy) => `You ${enemy <= 0 ? 'win' : 'lost'}! Your hp level - ${player}, opponents hp level - ${enemy}`,
  chance: (player, enemy) => `your chance - ${player}, your opponent chance - ${enemy}`,
  turn: (player, enemy, hit, isEnemy) =>
`${isEnemy ? 'Enemy' : 'Your'} turn...
${isEnemy ? 'Enemy' : 'You'} did a ${hit} hit
${isEnemy ? 'Your' : 'Enemy'} hp - ${isEnemy ? player : enemy}`,
};


const simpleFight = () => {
  const hp = [ 100, 100 ];

  console.log(messages.start(...hp));

  while (hp.every(n => n > 0)) {
    const chances = hp.map(() => Math.random() * 11 | 0);

    console.log(messages.chance(...chances));

    if (chances[0] !== chances[1]) {
      const chance = Math.max(...chances);
      const attack = attacks.find(n => n.minChance < chance);
      const isEnemyAttacks = chance === chances[1];
      hp[+!isEnemyAttacks] -= attack.damage;

      console.log(messages.turn(...hp, attack.name, isEnemyAttacks));
    }
  }

  console.log(messages.end(...hp));
};

const sum = str.match(/\d+/g).reduce((acc, n) => acc + +n, 0);

// или

let sum = 0;
for (const n of str.split(/\D+/)) {
  sum += Number(n);
}

preg_match_all('/\d+/', $str, $matches);
$sum = array_sum($matches[0]);

// или

$sum = 0;
foreach (preg_split('/\D+/', $str) as $n) {
  $sum += intval($n);
}

id="mse2_ms|price_0"

this.setState(({ appData }) => ({
  appData: {
    ...appData,
    unfinished: {
      ...appData.unfinished,
      [name]: value,
    },
  },
}));

new ymaps.Map("map", {

this.setState(({ books }) => ({
  books: [ ...books, ...newBooks ],
}));