Lambda expressions

The principal purpouse of this operator is declare anonymous functions(throw-away functions).

General syntax

argument list : expression

Examples

A typical example of lambda expressions is the use of arithmetic expressions but this operator can be used in a lot of situations

f = lambda x, y: x + y f(1,2) # outPut : 3 

f = lambda x: x[0] f([2,3,4,5,6,7]) # outPut : 2 

f = lambda x, y: x if x < y else y f(1,2) # outPut : 2 

You can do a fast implement of tiny usefull functions, like len():

size = lambda x : 1 + size(x[1:]) if x != [] else 0 size([1,2,3]) # outPut : 3 

By itself, lambda operator is very useful, but we can seriously take advantage of it combining it with list/dict comprehension, maps, reduces and filters. In that case we will see the real power of this operator.