Yashotantra Academy logo
← Clarity theorytheory 0/50 · 0%
level 1
Curious · 0 XP
streak
0d
perfect
0
badges
0

100 XP to Apprentice

Functions · medium

33. List Operations: map, filter, and fold

Functional list transformations in Clarity.

1 min read2 questionsup to 50 XPtopic 33/50

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

Clarity supports higher-order functions over bounded lists: `map` (transform), `filter` (predicate selection), and `fold` (reduction).

clarity
(define-private (is-even (val uint))
  (is-eq (mod val u2) u0))

(filter is-even (list u1 u2 u3 u4)) ;; (list u2 u4)

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. Which function reduces a list down to a single accumulated value?

  2. 2. Can a function passed to map or filter perform state changes (var-set)?

Badges

First light
Pass your first topic
Sharp shooter
3 perfect first-try quizzes
On a roll
Study 3 days in a row
Week warrior
Study 7 days in a row
Grinder
Earn 500 XP
Deep diver
Earn 1500 XP