What is the difference between map(), filter(), and reduce() in Python?

95 views
solveurit24@gmail.com
0 Comments

What is the difference between map(), filter(), and reduce() in Python?

What is the difference between map(), filter(), and reduce() in Python?

solveurit24@gmail.com Changed status to publish February 13, 2025
0

1 Answer

solveurit24@gmail.com
0 Comments
  • map(func, iterable): Applies func to each item in iterable and returns the results as an iterator.
  • filter(func, iterable): Returns items from iterable for which func returns True.
  • reduce(func, iterable): Applies func cumulatively to the items of iterable to produce a single result.

Example:

Copy Code 


from functools import reduce

# map: square each number
numbers = [1, 2, 3, 4]
squares = list(map(lambda x: x**2, numbers))  # [1, 4, 9, 16]

# filter: keep even numbers
evens = list(filter(lambda x: x % 2 == 0, numbers))  # [2, 4]

# reduce: sum all numbers
total = reduce(lambda x, y: x + y, numbers)  # 10

solveurit24@gmail.com Changed status to publish February 13, 2025
0