ShayDavidson

sevenBoom = function(n) {
  return xBoom(n, 7);
}
 
xBoom = function(n, boom) {
  return dividedBy(n, boom) || containsDigit(n, boom);
}
 
dividedBy = function(n, x) {
  return n % x == 0;

ShayDavidson

def print_spiral(mat)
  layers = (mat.length.to_f / 2).ceil
  layers.times do |layer|
    print_layer(mat, layer, layers)
  end
end

def print_layer(mat, layer, layers)
  if mat.length.odd? and (layer == layers - 1)
    puts mat[layer][layer]