Frontend Challenges

Challenges

Frontend Challenges is a collection of frontend interview questions and answers. It is designed to help you prepare for frontend interviews. It's free and open source.

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112

Challenges Solved

#6

hard

javascript

closure

#7

easy

javascript

promise

event loop

#8

easy

closure

javascript

#10

medium

javascript

#13

medium

javascript

lodash

#18

easy

javascript

utility

lodash

#20

hard

utility

lodash

javascript

InstanceOfClass

#32

easy

javascript

#35

hard

javascript

#37

hard

javascript

#43

hard

javascript

promise

#55

medium

javascript

performance

#58

medium

javascript

events

Logical Operators

#61

easy

javascript

logical operators

#66

easy

javascript

objects

Two functions - one object

#69

easy

javascript

objects

Array.prototype.filter

#74

easy

javascript

Array.prototype.map

#78

easy

javascript

Array.prototype.reduce

#82

medium

javascript

#86

easy

javascript

#91

easy

javascript

#95

easy

javascript

#99

easy

javascript

closure

Queue using Stack

#104

easy

javascript

#109

easy

javascript

#113

easy

javascript

forEach and this

#115

easy

javascript

#117

easy

javascript

#121

easy

javascript

F.prototype and constructor

#123

easy

javascript

Class and Prototype

#133

easy

javascript

Overriding constructor

#137

easy

javascript

#141

easy

javascript

#145

easy

javascript

#148

easy

javascript

#152

medium

javascript

#158

medium

javascript

#161

easy

javascript

Contains Duplicate

#179

easy

javascript

blind75

#188

easy

javascript

blind75

#191

medium

javascript

blind75

Top K Frequent Elements

#194

medium

javascript

blind75

String encode and decode

#197

medium

javascript

blind75

Products of Array Excluding Self

#199

medium

javascript

blind75

array

Longest Consecutive Sequence

#201

medium

javascript

blind75

array

hash-set

#203

easy

javascript

blind75

string

two-pointers

Three Integer Sum

#205

medium

javascript

blind75

array

two-pointers

Max Water Container

#207

medium

javascript

blind75

array

two-pointers

Best Time to Buy and Sell Stock

#209

easy

javascript

blind75

array

dynamic-programming

Longest Substring Without Repeating Characters

#211

medium

javascript

blind75

string

sliding-window

hash-map

Longest Repeating Substring With Replacement

#213

medium

javascript

blind75

string

sliding-window

Minimum Window With Characters

#215

hard

javascript

blind75

string

sliding-window

hash-map

Validate Parentheses

#217

easy

javascript

blind75

string

stack

Find Minimum in Rotated Sorted Array

#219

medium

javascript

blind75

array

binary-search

Find Target in Rotated Sorted Array

#221

medium

javascript

blind75

array

binary-search

Reverse a Linked List

#223

easy

javascript

blind75

linked-list

Merge Two Sorted Linked Lists

#225

easy

javascript

blind75

linked-list

Reorder Linked List

#227

medium

javascript

blind75

linked-list

Remove Node From End of Linked List

#229

medium

javascript

blind75

linked-list

two-pointers

Linked List Cycle Detection

#231

easy

javascript

blind75

linked-list

two-pointers

Merge K Sorted Linked Lists

#233

hard

javascript

blind75

linked-list

heap

divide-and-conquer

Invert a Binary Tree

#235

easy

javascript

blind75

binary-tree

recursion

Depth of Binary Tree

#237

easy

javascript

blind75

binary-tree

recursion

Same Binary Tree

#239

easy

javascript

blind75

binary-tree

recursion

Subtree of a Binary Tree

#241

easy

javascript

blind75

binary-tree

recursion

Lowest Common Ancestor in Binary Search Tree

#243

medium

javascript

blind75

binary-search-tree

recursion

Level Order Traversal of Binary Tree

#245

medium

javascript

blind75

binary-tree

bfs

Valid Binary Search Tree

#247

medium

javascript

blind75

binary-search-tree

recursion

Kth Smallest Integer in BST

#249

medium

javascript

blind75

binary-search-tree

recursion

Binary Tree from Preorder and Inorder Traversal

#251

medium

javascript

blind75

binary-tree

recursion

Binary Tree Maximum Path Sum

#253

hard

javascript

blind75

binary-tree

recursion

Serialize and Deserialize Binary Tree

#255

hard

javascript

blind75

binary-tree

serialization

Find Median in a Data Stream

#257

hard

javascript

blind75

heap

data-stream

Combination Target Sum

#259

medium

javascript

blind75

backtracking

recursion

Search for Word

#261

medium

javascript

blind75

backtracking

matrix

Implement Prefix Tree (Trie)

#263

medium

javascript

blind75

trie

data-structure

Design Word Search Data Structure

#265

medium

javascript

blind75

trie

data-structure

Search for Word II

#267

hard

javascript

blind75

trie

backtracking

matrix

Count Number of Islands

#269

medium

javascript

blind75

matrix

dfs

#271

medium

javascript

blind75

graph

dfs

Pacific Atlantic Water Flow

#273

medium

javascript

blind75

matrix

dfs

Course Schedule

#275

medium

javascript

blind75

graph

topological-sort

#277

medium

javascript

blind75

graph

union-find

Count Connected Components

#279

medium

javascript

blind75

graph

union-find

Foreign Dictionary

#281

hard

javascript

blind75

graph

topological-sort

Climbing Stairs

#283

easy

javascript

blind75

dynamic-programming

#285

medium

javascript

blind75

dynamic-programming

House Robber II

#287

medium

javascript

blind75

dynamic-programming

Longest Palindromic Substring

#289

medium

javascript

blind75

dynamic-programming

string

Palindromic Substrings

#291

medium

javascript

blind75

dynamic-programming

string

#293

medium

javascript

blind75

dynamic-programming

string

#295

medium

javascript

blind75

dynamic-programming

Maximum Product Subarray

#297

medium

javascript

blind75

dynamic-programming

array

#299

medium

javascript

blind75

dynamic-programming

string

Longest Increasing Subsequence

#301

medium

javascript

blind75

dynamic-programming

array

#303

medium

javascript

blind75

dynamic-programming

matrix

Longest Common Subsequence

#305

medium

javascript

blind75

dynamic-programming

string

Maximum Subarray

#307

medium

javascript

blind75

dynamic-programming

array

#309

medium

javascript

blind75

dynamic-programming

array

greedy

Insert New Interval

#311

medium

javascript

blind75

intervals

Merge Intervals

#313

medium

javascript

blind75

intervals

Non-overlapping Intervals

#315

medium

javascript

blind75

intervals

greedy

Meeting Schedule

#317

easy

javascript

blind75

intervals

Meeting Schedule II

#319

medium

javascript

blind75

intervals

greedy

#321

medium

javascript

blind75

matrix

#323

medium

javascript

blind75

matrix

Set Zeroes in Matrix

#325

medium

javascript

blind75

matrix

Number of One Bits

#327

easy

javascript

blind75

bit-manipulation

#329

easy

javascript

blind75

bit-manipulation

dynamic-programming

#331

easy

javascript

blind75

bit-manipulation

#333

easy

javascript

blind75

bit-manipulation

math

Sum of Two Integers

#335

medium

javascript

blind75

bit-manipulation

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