Remove the time challenge in Python
The challenge
You’re re-designing a blog and the blog’s posts have the following format for showing the date and time a post was made: …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Convert Hex to Decimal in Java
The challenge
Write a function that converts an input string contains a hex value, and return a decimal.
Test cases
import org.junit.Test;
import …Character with Longest Consecutive Repetition in Java
The challenge
For a given string s find the character c (or C) with longest consecutive repetition and return:
Object[]{c, l};
where l (or L) is the …
Check if List contains Item in Python
The challenge
Create a method that accepts a list and an item, and returns true if the item belongs to the list, otherwise false.
Test cases
list = …How To Create a User and Grant Permissions in MySQL
How to create a user
CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypassword';
How to delete a user
DROP USER …How to Remove Vowels with Python
The challenge
Create a function called shortcut to remove all the lowercase vowels in a given string.
Examples
shortcut("codewars") # --> …How to find all files in a directory with extension
I needed to find all files in a directory on Linux that ended with the file extension .php.
How to find all files in a directory with extension
You …
Read Article →How to Sort a List in Python
In this tutorial, you will learn how to sort a list in Python, by following the below three steps:
- Options to sort a list in Python
- What is the …
Cryptanalysis Word Patterns in Java
The challenge
In cryptanalysis, words patterns can be a useful tool in cracking simple ciphers.
A word pattern is a description of the patterns of …
Read Article →How to divide a number in Python
The challenge
Your task is to create functionisDivideBy (or is_divide_by) to check if an integer number is divisible by each out of two arguments.
A …
Read Article →How to Read Kubernetes Secrets
Kubernetes secrets is a great way to store secret values that only Kubernetes can access in your hosted applications.
There are times when you might …
Read Article →Backspaces in String Challenge using Java
The challenge
Assume "#" is like a backspace in string. This means that string "a#bc#d" actually is "bd"
Your task is to …
Read Article →How many times to Kaprekar’s constant using Python
Introduction
6174 is known as Kaprekar’s constant after the Indian mathematician D. R. Kaprekar. This number is notable for the following rule: …
Read Article →How to check if a String is a Number in Python
The challenge
Given a string s, write a method (function) that will return true if its a valid single integer or floating number or false if its not. …
Read Article →How to Write a Custom Comparator in Python
Generally, you want to use the built-in sorted() function which takes a custom comparator as its parameter. We need to pay attention to the fact that …
How to delete an AWS WAF – Web ACL
Usually, it’s quite easy to delete an AWS WAF, or Web ACL. But sometimes you may come across the following error when attempting to delete the …
Read Article →How to Sort an Integer in Python
Let’s say that you have an integer with value of 9271 and you want to sort it either ascending(1279) or descending(9721).
How would you do this …
Read Article →How to Upgrade PIP
In this tutorial, you will learn how to upgrade PIP.
You will also learn how to check the current version of PIP, as well as downgrade to a previous …
Read Article →How to Copy a File in Python
In this tutorial, you will learn how to copy a file using Python from a directory to another directory, or if you’re on Windows, then from a …
Read Article →Conway’s Game of Life – Unlimited Edition – in Python
What is this?
Read Article →Conways’s Game Of Life is a Cellular Automation Method created by John Conway. This game was created with Biology in mind but …
Most frequently used words in a text with Python
The challenge
Write a function that, given a string of text (possibly with punctuation and line-breaks), returns an array of the top-3 most occurring …
Read Article →The SongDecoder Dubstep Challenge with Java
The challenge
Polycarpus works as a DJ in the best Berland nightclub, and he often uses dubstep music in his performance. Recently, he has decided to …
Read Article →Break camelCase Challenge in Java
The challenge
Complete the solution so that the function will break up camel casing, using a space between words.
Example …
Read Article →Sort Binary Tree by Levels using Python
The challenge
You are given a binary tree:
class Node:
def __init__(self, L, R, n):
self.left = L
self.right = R …