How to LowerCase a String in Python
Python comes with a built-in method on all String types, by calling lower() on a String, you can immediately lower the case of that String.
Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Restart Sound Driver on a Mac
So for some strange reason, your audio has stopped playing through the Macbook Pro speakers, but if you plug in an external audio device, it still …
Read Article →Number to Binary Conversion in Python
If you have a decimal number, and want to get it’s binary value, you can use the built-in bin method.
decimal = 32
binary = bin(decimal)
# …Counting Binary Gaps with Python
The challenge
A binary gap within a positive integer N is any maximal sequence of consecutive zeros that is surrounded by ones at both ends in the …
Read Article →How to Delete a Secret in Kubernetes
Once you have a secret in Kubernetes, if you know it’s name, you can delete it.
How to find the secret name
You can get the secret name as …
Read Article →How to Decode a Secret in Kubernetes
Secrets in Kubernetes are encoded using base64.
If you have the secret name, you can ask for its value. If not, then learn how to get a secret in …
Read Article →How to Verify a Secret in Kubernetes
You have created a secret, and would like to retrieve it.
Get a list of all the secrets in Kubernetes
kubectl get secrets
This will result in:
NAME …How to Create a Secret in Kubernetes
Secrets allow applications to not hardcode usernames, passwords or additional information such as hostnames, IP addresses or other protected/sensitive …
How to Divide an Array into Chunks in PHP
If you have a single-dimensional array, and want to break it into chunks, you can use the array_chunks method.
It takes 3 arguments:
- The input array …
How to setup Certbot wildcard certificate on Apache
Certbot allows simple, quick and free provisioning of SSL certificates using LetsEncrypt.
How to install Certbot
Option 1 (recommended)
sudo snap …How to retrieve a Secret from AWS Secrets Manager in the CLI
If you have stored a secret in AWS using the Secrets Manager, it is possible to use the AWS CLI to retrieve this value at a later date.
aws …
Determine the Last Digits of N^2 == N in Java
The challenge
Let’s call an integer number N ‘green’ if N² ends with all of the digits of N. Some examples:
5 is green, because 5² = 25 …
How to Expose your App through a Service in Kubernetes
Once you have deployed an application into Kubernetes, it will not be available to the outside world.
For this to be possible, you need to expose it …
Read Article →How to connect to Bash on a Kubernetes pod
If you find yourself needing to jump into a Kubernetes pod to either diagnose an issue, or run a particular command, you can use the bash connectivity …
How to get the Environment variables in a Kubernetes Pod
In this comprehensive guide, you will learn how to effectively get and list environment variables within a Kubernetes pod. Understanding how to work …
Read Article →How to find out Cluster Info in Kubernetes
In Kubernetes, a cluster is a group of machines working together.
By running the kubectl cluster-info command, we can find out high level information …
How to set and use a kubeconfig in Kubernetes
The kubeconfig file is the main configuration file that allows access to a Kubernetes cluster.
When you first create your Kubernetes cluster, you are …
Read Article →How to Map over a List of Lists in Java
The challenge
Write a function which maps a function over the lists in a list:
public static <T,R> R[][] gridMap(Function<T,R> fn, T[][] …How to Differentiate a Polynomial in Java
The challenge
Create a function that differentiates a polynomial for a given value of x.
Your function will receive 2 arguments: a polynomial as a …
Read Article →Find the Sums of Perfect Squares in Java
The challenge
The task is simply stated. Given an integer n (3 < n < 10<sup>9</sup>), find the length of the smallest list of …
[Solved] Error: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.4.4:repackage (repackage)
If you have come across this error when trying to build and deploy your Spring Boot Maven application then this post will help you!
Error: Failed to …
[Solved] No main manifest attribute Solution for Jar/Maven/Gradle/Spring Boot
You’ve built a Java project and packaged a .jar file.
You are ready to run it outside your IDE, or deploy it somewhere.
When you run it using …
Read Article →[Solved] Error – The following untracked working tree files would be overwritten by merge
So you just tried to do a git pull and got the following error:
error: The following untracked working tree files would be overwritten by merge:
How …
Read Article →How to Strip Script Tags in PHP
If you have some HTML input submitted from a user to your application, before saving it to the database, you may want to strip all <script> tags …