Functional Programming
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Coding
Theory
Quiz
Pure Functions & Referential Transparency
Refactor to a Pure Function
Junior
Pure Group By via Fold
Mid
Thread the Counter State
Mid
Pure Frequency Map
Mid
Loop to Pure Fold: Max With Index
Mid
Pure ID Generator
Senior
Immutability & Persistent Data Structures
Immutable List Operations
Junior
Immutable Nested Update
Mid
Persistent Immutable Stack
Mid
Deep Freeze and Pure Update
Senior
Persistent Two-Stack Queue
Senior
Optics Transducers & Combinators
Factorial and Fibonacci in CPS
Mid
Parser Combinator Core
Senior
Arithmetic Expression Parser Combinator
Senior
Composable Record Lenses
Senior
Map and Filter Transducers
Mid
Verify the Lens Laws
Mid
Transducer Early Termination
Senior
Parse a Signed Integer
Mid
Map, Filter, Reduce via Transducers
Mid
Transducers with Right-to-Left Compose
Senior
Church Encoding From Scratch
Senior
CPS Expression Evaluator
Senior
Fixed-Point Combinator
Senior
Immutable Lens: view, set, over
Mid
Higher Order Functions
Map From Scratch
Junior
Left Fold From Scratch
Junior
Pure myFilter From Scratch
Junior
Function Factories with Closures
Junior
Combinator Toolbox
Mid
Element-Wise Zip With
Mid
Take While and Drop While
Mid
Predicate Combinators
Mid
Scan (Left Accumulate)
Mid
FlatMap Over a List
Mid
Function Composition & Point Free
Compose Functions Right-to-Left
Junior
Left-to-Right Pipe
Junior
Pure Map/Filter/Reduce Pipeline
Mid
Composable Comparators
Senior
Juxt and Converge Combinators
Senior
Point-Free Word Counter
Senior
Currying & Partial Application
Curry a Three-Argument Sum
Junior
Partial Application
Junior
Partial Application From the Right
Mid
Curry a Function
Senior
Closures & Memoization
Build a Counter Factory
Junior
Bank Account Closure
Junior
Memoize a Single-Argument Function
Mid
Memoized Fibonacci Closure
Mid
Once-Only Function Wrapper
Mid
Keyed Memoization with Resolver
Senior
Recursion & Folds
Recursive List Sum
Junior
Pure Recursive List Reversal
Junior
Mutually Recursive Even and Odd
Junior
Recursive Maximum of a List
Junior
Tail-Recursive Factorial
Mid
Tail-Recursive Fibonacci
Mid
Flatten Nested Lists
Mid
Fold From Scratch
Mid
Tail-Recursive Sum via Left Fold
Mid
Count and Sum Tree Leaves
Mid
Deriving List Functions From foldr
Senior
Stack-Safe Trampoline Driver
Senior
Ackermann Function
Senior
Stack-Safe Factorial Trampoline
Senior
Lazy Evaluation & Infinite Streams
Infinite Naturals and Take
Junior
Lazy Map and Filter
Junior
Lazy Range Generator
Junior
Lazy Infinite Fibonacci
Mid
Lazy takeWhile and dropWhile
Mid
Lazy Iterate Anamorphism
Mid
Memoized Thunk Primitive
Mid
Lazy Repeat and Cycle
Mid
Lazy Element-Wise Zip
Mid
Lazy Prime Sieve
Senior
Memoized Cons-Stream
Senior
Short-Circuiting Lazy Pipeline
Senior
Lazy Unfold Anamorphism
Senior
Lazy FlatMap
Senior
Lazy Windows and Chunks
Senior
Algebraic Data Types & Pattern Matching
Shape Area Sum Type
Junior
Cons-List Length
Junior
Peano Natural Numbers
Junior
Evaluate an Arithmetic Expression ADT
Mid
Binary Tree Depth and Sum
Mid
Option and Result ADTs
Mid
Recursive Map and Append on Cons-Lists
Mid
Count JSON Tree Nodes
Mid
Traffic Light State Machine
Mid
Fully-Parenthesized Expression Printer
Mid
Mirror a Binary Tree
Mid
Canonical JSON ADT Stringify
Senior
Vending Machine State Machine
Senior
Event-Sourced Bank Account
Senior
Tree Fold Catamorphism
Senior
Functors Monads & Applicatives
Maybe Functor Map
Junior
Maybe getOrElse and isNone
Junior
Total Functions with Maybe
Junior
Either Railway Validation
Mid
Maybe flatMap for Nested Lookups
Mid
Either Map and MapLeft
Mid
Box Functor and Its Laws
Mid
Sequence a List of Maybes
Mid
Writer Monad With Logging
Mid
Refactor Null Checks to a Maybe Monad
Mid
Identity Monad
Mid
Error-Accumulating Validation Applicative
Senior
State Monad Stack Machine
Senior
Lazy IO Monad
Senior
Traverse With Either
Senior
State-Monad RPN Evaluator
Senior
Applicative Maybe: ap and lift2
Senior
Kleisli Compose for Maybe
Senior
Top 225 Functional Programming Interview Questions And Answers 2025 | TechPrep