What are higher-order functions

Question

How to pass functions as parameters?

Answer 1

Higher-order functions are those functions that either take a function as a parameter or return it as an output. They can be user-defined functions or built-in functions for example map(), filter(), reduce(), etc.

EXAMPLE:

def newfunc(a):
    return a*a
x = map(newfunc, (1,2,3,4))  #x is the map object
print(x)
print(set(x))

OUTPUT: 

<map object at 0x00000284B9AEADD8>
{16, 1, 4, 9}

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