How to Validate an AWS CloudFormation Template
The AWS CLI comes with a useful subcommand to validate a CloudFormation template.
Simply run the following to validate a CloudFormation template file: …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to Reverse Sort Integers in Go
The challenge
The two oldest ages function/method needs to be completed. It should take an array of numbers as its argument and return the two highest …
Read Article →How to view the Encoded Authorization Failure Message in AWS
You may come across a message that reads similar to the following:
<meta charset="utf-8">Encoded authorization failure message
A full …
Read Article →How to run/execute a program from Terraform
If you need to run a local application from your Terraform scripts, you can call out to the provisioner local-exec and issue the command syntax: …
How to script AWS AppStream 2.0 ImageBuilder
AppStream (2.0) is a fully managed non-persistent desktop and application service for remotely accessing your work.
The ImageBuilder forms the first …
How to Reimplement the Unix Uniq Command in Golang
The challenge
Implement a function which behaves like the uniq command in UNIX.
It takes as input a sequence and returns a sequence in which all …
Read Article →How to install GraalVM on Mac
Install GraalVM with Homebrew
Homebrew is the preferred way to install anything on your Mac.
brew install graalvm/tap/graalvm-ce-java17
Install …
Read Article →How to Generate Random Integers with a Range in Java
Java comes with many different ways to generate random integers, even if you need to specify a lower and upper bound to constrain your required value …
Read Article →How to create ArrayList from Array in Java
The problem
If you have a traditional array, that looks something like the following:
A[] array = {new A(1), new A(2), new A(3)};
And you would like …
Read Article →How to Generate a Random AlphNumeric String in Linux/MacOS
If you need to generate a random AlphaNumeric string from the Linux/MacOS Command-Line, then you can use the following script:
dd if=/dev/random bs=8 …How to check if a string is empty in Go
If you need to check if a string is empty in Go, then there are two possible ways to immediately verify this:
Option 1 – Compare the length:
if len(s) …How to read a file line by line in Go
If you need to read a file line by line in Go, then you can use the bufio package as follows:
package main
import (
"bufio" …