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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.
Example:
const board = [
'·····',
'*····',
'@····',
'o····',
'o····'
]
console.log(moveTrain(board, 'U'))
// ➞ 'eat'
// Because the train moves up and finds a magical fruit
console.log(moveTrain(board, 'D'))
// ➞ 'crash'
// The train moves down and the head crashes into itself
console.log(moveTrain(board, 'L'))
// ➞ 'crash'
// The train moves to the left and crashes into the wall
console.log(moveTrain(board, 'R'))
// ➞ 'none'
// The train moves to the right and there is empty space on the right