The elves are playing with a magical train 🚂 that carries gifts. This train moves on a board represented by an array of strings.
The train consists of an engine (@), followed by its carriages (o), and must collect magical fruits (*) which serve as fuel. The movement of the train follows these rules:
You will receive two parameters board and mov.
board is an array of strings that represents the board:
@is the train's engine.oare the train's carriages.*is a magical fruit.·are empty spaces.
mov is a string that indicates the next movement of the train from the train's head @:
-
'L': left -
'R': right -
'U': up -
'D': down. With this information, you must return a string: -
'crash': If the train crashes into the edges of the board or itself. -
'eat': If the train collects a magical fruit (*). -
'none': If it moves without crashing or collecting any magical fruit.
const board = ['·····', '*····', '@····', 'o····', 'o····']
moveTrain(board, 'U') // The train moves up and finds a magical fruit.
// Expected result: 'eat'
moveTrain(board, 'D') // The train moves down and the head crashes into itself.
// Expected result: 'crash'
moveTrain(board, 'L') // The train moves to the left and crashes into the wall.
// Expected result: 'crash'
moveTrain(board, 'R') // The train moves to the right and there is empty space on the right.
// Expected result: 'none'