Santa 🎅 is testing his new electric sled, the CyberReindeer, on a North Pole road. The road is represented by a string of characters, where:
.= RoadS= Santa's Sled*= Open barrier|= Closed barrier
Example of a road: S...|....|.....
Each unit of time, the sled moves one position to the right. If it encounters a closed barrier, it stops until the barrier opens. If it is open, it goes through directly.
All barriers start closed, but after 5 units of time, they all open forever.
Create a function that simulates the sled's movement for a given time and returns an array of strings representing the state of the road at each unit of time:
const road = 'S..|...|..'
const time = 10 // units of time
const result = cyberReindeer(road, time)
/* -> result:
[
'S..|...|..', // initial state
'.S.|...|..', // sled advances on the road
'..S|...|..', // sled advances on the road
'..S|...|..', // sled stops at the barrier
'..S|...|..', // sled stops at the barrier
'...S...*..', // barrier opens, sled advances
'...*S..*..', // sled advances on the road
'...*.S.*..', // sled advances on the road
'...*..S*..', // sled advances on the road
'...*...S..', // passes through the open barrier
]
*/The result is an array where each element shows the road at each unit of time.
Take into account that if the sled is in the same position as a barrier, then it takes its place in the array.
The elves were inspired by this Code Wars challenge.