✌Higher-order functions in Python🤩

Higher-Order Functions:

A function is called Higher-Order Function if it contains other functions as a parameter or returns a function as an output. There are three built-in higher-order functions namely,

1. Map
2. Filter
3. Reduce

map()

The map() function iterates through all items in the given iterable and executes the function we passed as an argument on each of them.

def sq(*a):
  return a**2
a=[1,2,3,4,5]
print(map(sq,a))[1,4,9,16,25]

reduce()

Reduce doesn’t create a new list with that list we passed instead it returns a single value.

def sum(a,b):
  return a+b
a=[1,2,3,4,5]
print(map(sq,a))15

filter()

It filters the array and returns only the elements of that array which passed that given condition.

def even(a):
  return a%2==0
a=[1,2,3,4,5]
print(map(even,a))[2,4]