iex(2)> q = [1,2,3,4,5]
[1, 2, 3, 4, 5]
iex(3)> Queue.push(q,10)
[1, 2, 3, 4, 5, 10]
iex(4)> front=Queue.front(q)
1
iex(5)> Queue.empty?(q)
false
iex(6)> Queue.pop(q)
{1, [2, 3, 4, 5]}
iex(7)> l=[]
[]
iex(8)> Queue.empty?(l)
true