Easy
Monotonic Arrays
A monotonic array is an array whose elements, from left to right, are entirely non-increasing, or entirely non-decreasing. Return true if the given ar...
Easy
Countries List with Debounce
Debouncing is a method of preventing a function from being invoked too often, and instead of waiting a certain amount of time until it was last called...
Medium
Polyfills
A polyfill is a code snippet (in terms of javascript web architecture) used for modern world functionalities on older browsers that do not implement i...
Medium
Spiral Traversal
Given a 2D matrix of numbers, return a spiral traversal of the matrix in the clockwise direction.
Easy
Three Number Sum
Given an array of integers, find three integers in the array that sum to a specific target number.
Hard
Countdown Timer
A countdown timer has hours, minutes, and seconds that count down to 0 when started. In this problem, you are required to create a Countdown component...
Easy
Remove Duplicates From a Linked List
Given a sorted linked list, delete all duplicates such that each element appear only once.
Medium
Transfer List
Given a list of checkbox items, transfer checked items from one container to the other.
Easy
Guess The Output I
Given a set of instructions in javascript, guess the output of the given code snippet. It will have promises, setTimeout(), setInterval(), and other a...
Easy
Depth First Search
Depth-first search (DFS) is an algorithm for traversing or searching tree or graph data structures. The algorithm starts at the root node (selecting s...
Easy
Binary Search
Given an array of sorted integers in ascending order, and a target integer, write a function to search target in nums array. If target exists, return ...
Easy
Typewriter Effect
A Typewriter Effect is something where a piece of text constructs itself with some milliseconds in delay. You will see the text getting generated from...
Medium
Number of Ways To Make Change
Given a target amount and a set of denominations (coins), find the total number of ways the given target amount can be expressed by using the denomina...
Easy
Smallest Difference
Given two arrays of integers, find the pair of values (one value in each array) with the smallest (non-negative) difference.
Medium
Find Successor
Given the root of a binary tree and a node in it, return the in-order successor of that node in the BST. If the given node has no in-order successor i...