Combined drivers solution

combined-drivers-solution.js

function getMilliseconds(date) {
  const [hourse, minute] = date.split(':')
  return hourse*60*60 + minute*60
}

function sortingFn (a, z) {
  return getMilliseconds(a[0]) - getMilliseconds(z[0])
}

function combinedDrivers(city1, city2) {
  const sorted = city1.concat(city2).sort(sortingFn)
  
  for(let i = 0; i < sorted.length -1; i++) {
    if (sorted[i][0] === sorted[i+1][0]) {
      sorted[i][1] += sorted[i+1][1]
      sorted.splice(i+1, 1)
    }
  }
  
  return sorted
}

let bangalore = [['1:00', 10], ['1:15', 20], ['1:05', 12], ['2:00', 9]]
let kolkata = [['1:03', 11], ['1:30',3], ['2:30', 4], ['1:15', 11]]
let result = combinedDrivers(bangalore, kolkata)
console.log(result)