FP Example: Closures


Closure is a function that captures "surrounding" state

Classic Python does not have nested scopes

Can use default parameters to pass state into closure
>>> def addN(n):
...     return lambda x, a=n: x+a
...
>>> inc = addN(1)
>>> inc(3)
4
>>> addFive = addN(5)
>>> addFive(3)
8