IPv4 CIDR Chart
CIDR stands for Classless Inter-Domain Routing and is a method for allocating IP addresses as well as for IP routing.
It was introduced in 1993 by the …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
Recursively Delete Files and Folders and all Contents using PHP
Below is a quick and easy way to recursively delete all files and folders in a given path using PHP.
function destroy_dir($dir) {
if (!is_dir($dir) …Product Update: ADD becomes Serengeti
As a product update; The “Autonomous Distributed Database”, otherwise known as simply ADD has been renamed to Serengeti.
The Serengeti is …
Read Article →SQL to Append all Fields if Shorter than a set Length
This came in very handy for me at one point because I needed to have a certain field in each row 14 characters long, but half of them were only 12 …
Read Article →Validate Email Address in Javascript
Below is a nice little Javascript RegularExpression to validate email addresses.
/^\w.+@[a-zA-Z_.]+?\.[a-zA-Z.]{2,3}$/
..and to use it..
if …Remove hash from window.location in Javascript
E.g. URL:<br>http://example.com/?option=1&task=2&listing_id=36&layout=4&table=5#some_hash_value_here
So how would you get the …
Read Article →The Benefits and Dangers of Artificial Intelligence
Artificial Intelligence (AI) is usually defined as the science of making computers do things that require intelligence when done by humans. (Jack …
Read Article →The Decoded String at Index using Java
The Challenge
An encoded string S is given. To find and write the decoded string to a tape, the encoded string is read one character at a time and …
Timing Issues in Real-time systems
What are Real-time Systems?
If you look up the term “real-time” in a dictionary, it will tell you that it is the actual time during which …
Read Article →Find the Minimum Absolute Difference in BST using Java
The question
Given a binary search tree with non-negative values, find the minimum absolute difference between values of any two nodes.
Example: …
Read Article →Get the Second Highest Salary in MySQL
The problem
Write a SQL query to get the second highest salary from the Employee table.
For example, given the above Employee table, the query …
Read Article →Find Maximum Subarrays using Java
The problem
Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. …