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Learn JavaScript in one week
An introductory course on JavaScript covering basic topics.
Basic array manipulation with functions in JavaScript
This tutorial explains some common array functions and how to create and manipulate them.
Questions on closures
Closures are an important topic to understand when learning JavaScript. Here are a few common closure questions with solutions.
10 common JavaScript interview questions
Some common interview questions with topics such as decimal numbers, scope, private variables, and more.
Map, reduce, and filter - functional programming
Introduction to functional programming methods in JavaScript.
Implement bubble sort
Code for implementing the simple but slow sorting algorithm, bubble sort.
Dutch national flag sorting problem
Question and solution for sorting an array of 0's, 1's, and 2's in place and in linear time.
Two sum problem
A popular interview question that requires you to determine if two numbers in an array sum to a specific value. A solution can be written that runs in linear time.
First Factorial
For this challenge you will be determining the factorial for a given number.
48335 solutions
Solution
Longest Word
For this challenge you will be determining the largest word in a string.
37972 solutions
Solution
Letter Changes
For this challenge you will be manipulating characters in a string based off their positions in the alphabet.
38019 solutions
Solution
Simple Adding
For this challenge you will be adding up all the numbers from 1 to a certain argument.
32298 solutions
Solution
Letter Capitalize
For this challenge you will be capitalizing certain characters in a string.
27568 solutions
Solution
Simple Symbols
For this challenge you will be determining whether or not certain characters are in correct positions.
21533 solutions
Solution
Check Nums
For this challenge you will be comparing two numbers and determining which one is greater.
23360 solutions
Solution
Time Convert
For this challenge you will be determining the difference in hours and minutes between two given times.
17558 solutions
Solution
Alphabet Soup
For this challenge you will be sorting characters in a string.
16586 solutions
Solution
Vowel Count
For this challenge you will be counting all the vowels in a string.
13997 solutions
Solution
Word Count
For this challenge you will be determining how many words a sentence contains.
13214 solutions
Solution
Palindrome
For this challenge you will determine if a string is written the same way forward and backwards.
14717 solutions
Solution
Array Addition I
For this challenge you will determine if numbers in an array can add up to a certain number in the array.
7170 solutions
Solution
Letter Count I
For this challenge you will determine which word has the greatest number of repeated letters.
6530 solutions
Solution
Second GreatLow
For this challenge you will determine the second lowest and greatest numbers in an array.
11104 solutions
Solution
Division Stringified
For this challenge you will divide two numbers and return them in a certain format.
8332 solutions
Solution
Counting Minutes I
For this challenge you will return the total number of minutes between two times.
4930 solutions
Solution
Dash Insert
For this challenge you will be manipulating a string using dashes (-).
7329 solutions
Solution
Number Addition
For this challenge you will traverse a string searching for all the numbers and then you will add them up.
6903 solutions
Solution
Third Greatest
For this challenge you will determine the third largest string within an array.
6391 solutions
Solution
Powers of Two
For this challenge you will be determining whether or not a number is a power of two.
7147 solutions
Solution
Additive Persistence
For this challenge you will be determining the additive persistence for a given number.
4934 solutions
Solution
Multiplicative Persistence
For this challenge you will be determining the multiplicative persistence for a given number.
3862 solutions
Solution
Off Line Minimum
For this challenge you will be creating a subset of an array.
5131 solutions
Solution
Changing Sequence
For this challenge you will determine when an array changes sequences.
1652 solutions
Solution
Overlapping Ranges
For this practice test you will determine the intersection between two sets.
1682 solutions
Solution
Superincreasing
For this challenge you will determine if each number is greater than the sum of all previous elements in an array.
1632 solutions
Solution
Hamming Distance
For this challenge you will determine the difference between two strings.
1119 solutions
Solution
Rectangle Area
For this challenge you will determine the area of a rectangle.
1357 solutions
Solution
Bitwise One
For this challenge you will perform a bitwise operation on two binary numbers.
1121 solutions
Solution
Other Products
For this challenge you will return the product of a set of elements in an array.
928 solutions
Solution
Wave Sorting
For this challenge you will determine if numbers in an array can be sorted in a particular way.
628 solutions
Solution
Array Matching
For this challenge you will add elements from two arrays in a particular order.
713 solutions
Solution
Longest Increasing Sequence
For this challenge you will compute the length of the longest increasing subsequence.
555 solutions
Solution
Even Pairs
For this challenge you will determine if a pair of even numbers exists somewhere in a string.
518 solutions
Solution
Next Palindrome
For this challenge you will be determining the next largest palindrome.
495 solutions
Solution
Largest Pair
For this challenge you will determine the largest double digit number.
692 solutions
Solution
Nonrepeating Character
For this challenge you will find the first non-repeating character in a string.
515 solutions
Solution
Bitwise Two
For this challenge you will perform a bitwise operation on two binary numbers.
348 solutions
Solution
Power Set Count
For this challenge you will determine the length of a power set.
523 solutions
Solution
Product Digits
For this challenge you will be determining the least amount of digits needed to produce a number.
701 solutions
Solution
Palindrome Creator
For this challenge you will be determining if you can create a palindrome from a list of numbers.
505 solutions
Solution
Basic Roman Numerals
For this challenge you will be converting a string of Roman numerals.
365 solutions
Solution
Food Distribution
For this challenge you will determine how to optimally distribute food to people.
296 solutions
Solution
Correct Path
For this challenge you will be traversing a matrix searching for the correct path to take.
188 solutions
Solution
Scale Balancing
For this challenge you will be balancing a scale with weights on it.
256 solutions
Solution
Three Numbers
For this challenge you will be searching for a set of numbers in a string.
258 solutions
Solution
Alphabet Searching
For this challenge you will determine if a set of characters exists in a string.
257 solutions
Solution
Time Difference
For this challenge you will be searching for the smallest time difference.
132 solutions
Solution
Triangle Row
For this challenge you will be adding up a whole row from Pascal's triangle.
136 solutions
Solution
Vowel Square
For this challenge you will determine if a square of vowels exists in a matrix.
160 solutions
Solution
Largest Four
For this challenge you will need to find the four largest elements in an array.
185 solutions
Solution
Distinct Characters
For this challenge you will determine if a string contains some number of distinct characters.
110 solutions
Solution
Questions Marks
For this challenge you will be determining if a string follows a particular pattern.
135 solutions
Solution
Camel Case
For this challenge you will be converting a string into camel case format.
127 solutions
Solution
ASCII Conversion
For this challenge you will be replacing certain characters in a string.
80 solutions
Solution
Simple Evens
For this challenge you will be checking whether a number is even.
130 solutions
Solution
Snake Case
For this challenge you will be converting a string into snake case format.
107 solutions
Solution
Sum Multiplier
For this challenge you will determine if two numbers can be multiplied to some specific number.
141 solutions
Solution
String Merge
For this challenge you will be merging two different strings together.
130 solutions
Solution
One Decremented
For this challenge you will be counting how many times a specific pattern occurs in a large number.
111 solutions
Solution
Element Merger
For this challenge you will be combining all of the elements in an array into a single number.
134 solutions
Solution
Serial Number
For this challenge you will be determining if a string produces a valid serial number.
62 solutions
Solution