Coding Prep

Master coding interviews with our curated collection of JavaScript problems. Practice with real-time code execution and detailed explanations.

8

Total Problems

Interactive

Code Editor

Real-time

Testing

All Levels

All Topics

Showing 8 of 8 problems

Array Grouping by Name

Easy

Given an array of arrays where each sub-array contains a name and a value, group all values by their corresponding names into an object.

Array

Object

Iteration

10 minAcceptance: 65.2%

Two Sum

Easy

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

Array

Hash Table

15 minAcceptance: 49.1%

Palindrome Number

Easy

Given an integer x, return true if x is palindrome integer. An integer is a palindrome when it reads the same backward as forward.

Math

10 minAcceptance: 52.3%

Add Two Numbers

Medium

You are given two non-empty linked lists representing two non-negative integers. Add the two numbers and return the sum as a linked list.

Linked List

Math

Recursion

25 minAcceptance: 38.7%

Longest Substring Without Repeating Characters

Medium

Given a string s, find the length of the longest substring without repeating characters.

Hash Table

String

Sliding Window

30 minAcceptance: 33.8%

Median of Two Sorted Arrays

Hard

Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays.

Array

Binary Search

Divide and Conquer

45 minAcceptance: 35.2%

Regular Expression Matching

Hard

Given an input string s and a pattern p, implement regular expression matching with support for '.' and '*'.

String

Dynamic Programming

Recursion

50 minAcceptance: 27.9%

Unique Characters with Set

Easy

Given a string, return the count of unique characters using JavaScript Set. For example, 'hello' should return 4 (h, e, l, o).

Set

String

Data Structures

8 minAcceptance: 78.5%

Shyam Kunwar

Coding Prep

8

Interactive

Real-time

Array Grouping by Name

Two Sum

Palindrome Number

Add Two Numbers

Longest Substring Without Repeating Characters

Median of Two Sorted Arrays

Regular Expression Matching

Unique Characters with Set