How to Reverse a String in Golang
The challenge
Complete the solution so that it reverses the string passed into it.
'world' => 'dlrow'
'word' => …Technical Articles
In-depth guides, insights, and best practices for modern software engineering
Maximum Different of Int-Array in Java
The challenge
You must implement a function that returns the difference between the biggest and the smallest value in a list(lst) received as a …
Read Article →Indexed Capitalization in Java
The challenge
Given a string and an array of integers representing indices, capitalize all letters at the given indices.
Example: …
Read Article →How to Spacify a String in Java
The challenge
Modify the spacify function so that it returns the given string with spaces inserted between each character.
spacify("hello …How to Find the Last Digit of a Huge Number in Golang
The challenge
For a given list [x1, x2, x3, ..., xn] compute the last (decimal) digit of x1 ^ (x2 ^ (x3 ^ (... ^ xn))).
Example:
last_digit({3, 4, 2}, …Find the Maximum Length Difference between Lists/Arrays in Python
The challenge
You are given two arrays a1 and a2 of strings. Each string is composed of letters from a to z. Let x be any string in the first array …
How to Circularly Sort an Array in Golang
The challenge
An array is circularly sorted if the elements are sorted in ascending order but displaced, or rotated, by any number of steps.
Complete …
Read Article →Largest Number Groupings in String in Python
The challenge
You are be given a string that has lowercase letters and numbers. Your task is to compare the number groupings and return the largest …
Read Article →How to Alternate String Casing in Golang
The challenge
Write a function toWeirdCase (weirdcase in Ruby) that accepts a string, and returns the same string with all even indexed characters in …
How to Sort a List of Numbers in Python
The challenge
Finish the solution so that it sorts the passed-in array/list of numbers. If the function passes in an empty array/list or null/None …
Read Article →How to Validate Usernames with Regex in Java
The challenge
Write a simple regex to validate a username. Allowed characters are:
- lowercase letters,
- numbers,
- underscore
Length should be between 4 …
Read Article →Sort Lexicographical Order of Substrings in Java
The challenge
Given two arrays of strings a1 and a2 return a sorted array r in lexicographical order of the strings of a1 which are substrings of …
How to Perform Alphabetical Addition in Java
The challenge
Your task is to add up letters to one letter.
The function will be given an array of single-character Strings, each one being a letter …
Read Article →Roman Numerals Decoder in Golang
The challenge
Create a function that takes a Roman numeral as its argument and returns its value as a numeric decimal integer. You don’t need to …
Read Article →How to Subtract from Time in Golang
The challenge
Clock shows h hours, m minutes and s seconds after midnight.
Your task is to write a function that returns the time since midnight in …
Read Article →How to Encrypt Words in Java
The challenge
You want to create secret messages which must be deciphered.
Here are the conditions:
- Your message is a string containing space …
Bit Counting in Golang
The challenge
Write a function that takes an integer as input, and returns the number of bits that are equal to one in the binary representation of …
Read Article →How to Find Next Higher Number with Same Bits in Golang
The challenge
Find the next higher number (int) with same ‘1’- Bits.
I.e. as much 1 bits as before and output next higher than input. Input is …
How to Find the First Non-Repeating Character in Golang
The challenge
Write a function named first_non_repeating_letter that takes a string input, and returns the first character that is not repeated …
How to Find the Last Fibonacci Digit in Golang
The challenge
Return the last digit of the nth element in the Fibonacci sequence (starting with 1,1, to be extra clear, not with 0,1 or other …
Read Article →How to Validate an IP Address in Golang
The challenge
Write an algorithm that will identify valid IPv4 addresses in dot-decimal format. IPs should be considered valid if they consist of four …
Read Article →How to Fold an Array in Java
The challenge
In this challenge, you have to write a method that folds a given array of integers by the middle x-times.
An example says more than a …
Read Article →Formatting Strings with Fmt in Golang
Fmt provides printing to standard output (usually the console) and formatting of strings capabilities.
The basics of Print and Println
The main …
Read Article →Delete Occurrences of an Element if it occurs more than N times in Java
The challenge
Given a list lst and a number N, create a new list that contains each number of lst at most N times without reordering. For example if N …
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