hzzzzl

states = {
  DISABLED: 0b001,   // так можно писать двоичные числа
  FOCUSED: 0b010,
  HOVERED: 0b100,
}

(states.DISABLED | states.HOVERED).toString(2)  // .toString(2) - переводит в двоичную
// "101"   // поставлены 1 и 3 биты

[...Array(12)].map((row, x) => 
  [...Array(31)].map((col, y) => x * 31 + y)
)

doc1 = [850, 950, 1100]   // для удобства счета 800 = 8:00 850 = 8:30 итд
doc2 = [1100, 1200]
doc3 = [1000]
docs = [doc1, doc2, doc3]

STEP = 50 // 0.5 часа

for (let i = 800; i < 1400; i += STEP){
  console.log(i)
  const found = docs.filter(d => !d.some(time => [i - STEP, i, i + STEP].includes(time)))
  console.log(found)   // выводит доступных врачей на время i, или пустой массив, если никого нет
}

data = [
  {"name":"Adhi Kot","id":"379","nametype":"Valid","recclass":"EH4","mass":"4239","fall":"Fell","year":"1919-01-01T00:00:00.000","reclat":"32.100000","reclong":"71.800000","geolocation":{"type":"Point","coordinates":[71.8,32.1]}},
  {"name":"Adzhi-Bogdo (stone)","id":"390","nametype":"Valid","recclass":"LL3-6","mass":"910","fall":"Fell","year":"1949-01-01T00:00:00.000","reclat":"44.833330","reclong":"95.166670","geolocation":{"type":"Point","coordinates":[95.16667,44.83333]}}
]

const find = (rec, key) => (data.find(v => v.recclass === rec) || {})[key]

find('EH4', 'mass')
// 4239