philipp-spiess

def zeuge(a, n)
  b = (n-1).to_s(2) # binary representation
  d = 1
  
  b.reverse.split('').each do |i| 
    d = (d*d) % n
    if i.to_i == 1
      d = (d*a) % n
    end
    puts "#{i}: #{d}"

philipp-spiess

db.foo.insert( { name: "Mario", fach: ["E", "D"] } );
db.foo.insert( { name: "Philipp", fach: ["PR", "D"] } );

db.foo.find();
db.foo.find( { name: "Mario" } );
db.foo.find( { fach: { $in : [ "E", "M" ] } } );

db.foo.update( { name: "Mario" }, { $push: { fach: "M" } } );
db.foo.find( { name: "Mario" } );