mediumDSA

What are lambda functions and map/filter/reduce?

Q: What are lambda functions and map/filter/reduce?

A **lambda** is a small anonymous function: `lambda x: x*2`. **`map`** applies a function to each item, **`filter`** keeps items passing a predicate, and **`reduce`** (from functools) folds a sequence to one value. Comprehensions are often preferred for readability.

823 views

Understand the problem

Explain functional tools.

lambdafunctional

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

Study the solution

A lambda is a small anonymous function: lambda x: x*2. map applies a function to each item, filter keeps items passing a predicate, and reduce (from functools) folds a sequence to one value. Comprehensions are often preferred for readability.

Solution ready — 2 min read

Classified // press E to declassify

Run the code

PYlambda key + map/filter/reduce vs comprehension

Practice

Join the discussion

Discussion (0)

No responses yet. Be the first to share what you think.

Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 45 of 120 decoded in the Python track. One more won't hurt.

Back to track

Next up→

What is the difference between classmethod and staticmethod?

Continue