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// Fetched from server
const nestedNumbers = [
  [[0], [[[[[[[1, 2]]]]]]], [3]],
  [[[4], [[5]]], [[[6, 7, 8]]]],
  [9]
];

const incrementNestedNumbers = (arrayWithNums) => {
  for (let i = 0; i < arrayWithNums.length; i++) {
    if (Array.isArray(arrayWithNums[i])) { // if array

Uzwername

const nestedNumbers = [
  [[0], [[[[[[[1, 2]]]]]]], [3]],
  [[[4], [[5]]], [[[6, 7, 8]]]],
  [9]
];

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out = [];
for (let i = 0; i < 2; i++) {
  for (let j = 0; j < 2; j++) {
    out.push([ i, j ]);
  }
}

console.log(out); // -> [[ 0, 0 ], [ 0, 1 ], [ 1, 0 ], [ 1, 1 ]]

Uzwername

sum();
sum(1, 1)();
sum(1)(5)(12)();
sum(1)(132, 4)();
sum(1, 2, 3)(7, 8, 9)(5)();
sum(1, 1)(4)(6, 13, 7)(2)(3)(2)(2, 1)();

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const comments = [
  {
    text: 'comment 1',
    comments: [
      {
        text: 'comment 2',
        comments: [],
      },
    ],
  },

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const traverseHtmlElement = (rootElement, _level = 0) => {
  // Get all element's children stringified if any
  let rootChildren = '';
  if (rootElement.childElementCount) {
    rootChildren = traverseHtmlElement(rootElement.firstElementChild, _level + 1);
  }

  // Get all element's siblings stringified if any
  let rootSiblings = '';
  const nextSibling = rootElement.nextElementSibling;

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const bodyChildren = [...document.body.children];

for (let i = 0; i < bodyChildren.length; i++) {
  // So... how do we get children of each body child?
  analyseElement(bodyChildren[i]);
}

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const flatToBase = array => array.reduce(
  (accumulator, value) => accumulator.concat(
    Array.isArray(value) ? flatToBase(value) : value
  ),
  [],
);

flatToBase([[[[[[[ 42 ]]]], 36]]]); // -> [ 42, 36 ] 

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nestedArrays.flat(Infinity);

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const mirrorNumbersUpTo = (num) => {
  console.log(num);

  if (num > 0) {
    mirrorNumbersUpTo(num - 1);
    console.log(num);
  }
};

mirrorNumbersUpTo(5); // ➡️ logs 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5