Сергей Соколов

const centerString = '56.964949, 60.623745';

// строку разбиваем в массив чисел
const center = centerString.split(', ').map(Number);
const zoom = 12;

const params = {
  center,
  zoom,
};

const init = () => {
  const myMap = new ymaps.Map("map", params);
}

ymaps.ready(init);

const chain = async times => {
  for (let n = times; n > 0; n--) {
    console.log(`${n} starting..`);
    await new Promise(resolve => setTimeout(resolve, 800));
    console.log(`${n} ..finished`);
  }
};

chain(4).then(() => console.log('Done'));

function workHours(on, off, testNow = null) {
  // TODO: validate input
  const now = testNow ?? new Date().getHours();
  const a = Number(on);
  let b = Number(off);

  const format = (status, nextTime) => ({ status, next_time: nextTime });

  if (a === b) {
    return format(true, 0);
  }

  if (a > b) {
    b += 24;
  }

  if (now >= a && now < b) {
    return format(true, 0);
  }

  if (now < a) {
    return format(false, a - now);
  }

  return format(false, a + 24 - now);
}

// Тесты тесты
const tests = [
  [9, 17, 10, { status: true, next_time: 0 }],
  [9, 17, 8, { status: false, next_time: 1 }],
  [9, 17, 17, { status: false, next_time: 16 }],
  [19, 17, 17, { status: false, next_time: 2 }],
  [19, 19, 17, { status: true, next_time: 0 }],
];

const eq = (a, b) => Object.entries(a).every(([k, v]) => b[k] === v);

tests.forEach(test => {
  const [on, off, now, expected] = test;
  const result = workHours(on, off, now);
  const testResult = eq(result, expected);
  if (testResult) {
    console.log('Passed', {on, off, now, result});
  }
  console.assert(testResult, test);
});

- console.log(data.data.values)
+ console.log(data.values)

(arr => Object.fromEntries(['a', 'b', 'c'].map((p, i) => [p, arr[i]])))([1, 2, 3])
// Object { a: 1, b: 2, c: 3 }

// или так, что чуть короче, но такой же фарс
(arr => Object.fromEntries(Array.from('abc', (p, i) => [p, arr[i]])))([1, 2, 3])

const findRangeKey = (keysArray, keyString) => {
  const num = Number(keyString);
  if (keysArray.includes(keyString)) {
    // exact match
    return keyString;
  }

  return keysArray.find(key => {
    const [min, max] = key.split('-').map(Number);
    if (max !== undefined) {
      return num >= min && num <= max;
    }

    return num === min;
  });
};

findRangeKey(['10', '20-40'], 30); // "20-40"
findRangeKey(['10', '20-40'], 20); // "20-40"
findRangeKey(['10', '20-40'], 10); // "10"

const data = {
  '10': {
    '5-15': {
      title: '10-5-15',
    }
  },
  '20-60': {
    '5': { title: '20-60-5' },
    '10': { title: '20-60-10' },
    '20-40': { title: '20-60-20-40' },
  },
};

const getTitle = (data, a, b) => {
  const aKey = findRangeKey(Object.keys(data), a);
  if (!aKey) {
    return null;
  }

  const bKey = findRangeKey(Object.keys(data[aKey]), b);
  if (!bKey) {
    return null;
  }

  return data[aKey][bKey].title;
};

console.log(getTitle(data, '10', '5')); // "10-5-15"
console.log(getTitle(data, 40, 30)); // "20-60-20-40"

const keys = ['key1', 'key2', 'key3'];
const values = ['value1', 'value2', 'value3', 'value4', 'valu5', 'value6'];

const makeGen = function*(arr) {
  let index = 0;
  const { length } = arr;
  
  while (true) {
    yield arr[index++ % length];
  }
}

const keyGen = makeGen(keys);
const valGen = makeGen(values);
const length = Math.max(keys.length, values.length);

const result = Array.from({ length }, () => [keyGen.next().value, valGen.next().value]);

console.log(JSON.stringify(result, null, 2));

/*
[
  [
    "key1",
    "value1"
  ],
  [
    "key2",
    "value2"
  ],
  [
    "key3",
    "value3"
  ],
  [
    "key1",
    "value4"
  ],
  [
    "key2",
    "valu5"
  ],
  [
    "key3",
    "value6"
  ]
]
*/

- elem.fadeOut();
+ $('selector').fadeOut();

1. Собрать в массив имена ключей, которые будем «переименовывать».
   
2. Пройти по этому массиву:
   
   • брать значение из Map
     
   • создавать новый toLowerCase() ключ с этим значением
     
   • удалять исходный ключ
     

const MyMap = new Map([['aAa', 'A'], ['bbb', 'B'], ['CcC', 'C']]);
const toRename = [...MyMap.keys()].filter(key => key.toLowerCase() !== key);
// [ "aAa", "CcC" ]

toRename.forEach(key => {
  MyMap.set(key.toLowerCase(), MyMap.get(key));
  MyMap.delete(key);
});
// MyMap: { bbb → "B", aaa → "A", ccc → "C" }