Use Array#push instead of direct assignment to add items to an array.

const someStack = [];
// bad
someStack[someStack.length] = 'abracadabra';
// good
someStack.push('abracadabra');

4.4 To convert an iterable object to an array, use spreads ... instead of .

const foo = document.querySelectorAll('.foo');
// good
const nodes = Array.from(foo);
// best
const nodes = [...foo];

Use Array.from for converting an array-like object to an array.

Use return statements in array method callbacks. It’s ok to omit the return if the function body consists of a single statement returning an expression without side effects, following 8.2. eslint:

// bad
const arr = [
  [0, 1], [2, 3], [4, 5],
];
const objectInArray = [{
  id: 1,
}, {
  id: 2,
}];
  1, 2,
];
// good
const arr = [[0, 1], [2, 3], [4, 5]];
const objectInArray = [
  {
    id: 1,
  },
  {
    id: 2,
  },
];
const numberInArray = [
  1,
  2,