Diagonal star on dinamic grid thingy

index.coffee

diagDir = false
x = 5
y = 9

console.clear()

# Initialize that shizzle
grid = []
for i in [0...10]
  grid.push []
  for j in [0...10]
    grid[i].push '-'

# Mark that shizzle
while grid[x]?[y]?
  grid[x][y] = '*'
  if diagDir
    x++
    y++
  else
    x--
    y--

# Output that shizzle
out = ''
for i in [0...grid.length]
  out += grid[i].join(' ') + '\n'
console.log out