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Top 50 functions Interview Questions

The most frequently asked functions questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~21htotal time
715companies covered
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1
StringsStart here. 3 questions · ~75 min
Reverse a String in PythonEasy
Practice
Recently asked

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonCNAAct DigitalLos Alamos National Laboratory
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2
Recursion3 questions · ~75 min
Reverse a Linked ListEasy
Practice
Recently asked

Reverse a singly linked list iteratively and recursively while preserving every node and returning the new head.

Recursioncoding challengeLinked ListsNetsuiteMacquarie GroupAAppLogic Networks
Reverse String Without LibrariesEasy
Practice
Recently asked

Reverse a string by iterating from its final character without using built-in reversal functions.

RecursionBasic AlgorithmsStringsPaytmSStandard Chartered BankGGeekyants Software
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3
Arrays4 questions · ~100 min
In-Place Array ReversalEasy
Practice
Recently asked

Reverse an array in place by swapping symmetric elements with two pointers.

ArraysfunctionsArray ManipulationHCLTechIntelligence NodeFourkites
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4
deduplication4 questions · ~100 min
Reverse String or Find DuplicatesEasy
Practice
Recently asked

Find the first repeated array element using a set in O(n) time.

deduplicationArraysStringsWebmdWalmart Global TechAvaility
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5
javascript3 questions · ~75 min
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6
functions13 questions · ~325 min
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7
More topics20 questions · ~500 min
Linked List and Tree TraversalEasy
Practice

Return Groupon deal category values level by level using breadth-first search on a binary tree.

Linked ListsfunctionsTreesSSeekOutRupeekGroupon
Reverse a String Without Built-insEasy
Practice
Recently asked

Reverse a string character by character without using built-in reverse methods.

CodingjavascriptStringsAir AppsRBCItlize Global
Parse Logs for Error PatternsMedium
Practice

Parse Pinterest infrastructure logs, count matching error patterns, and rank affected services using dictionaries and sorting.

log parsingfunctionsPinterestLinkedInPony.Ai
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