Let’s say you want to copy the MySQL database used on a website to a local installation of PHP/MySQL for testing. In order to do this, you will need the following: Access to the cpanel of the website that has phpMyAdmin installed An Apache server with phpMyAdmin installed locally. For this, you can use Bitnami’s … Continue reading MySQL: How to copy database from web host to localhost
Kotlin: How to use the ‘when’ expression
In addition to if, for, and while loops, Kotlin also has a control flow option called when. The ‘when’ expression acts just like a switch operator you might see in other languages. The basic structure looks like this: Some notes about this switch structure: The first line uses the key word when followed by a … Continue reading Kotlin: How to use the ‘when’ expression
Kotlin: How to use .filter( ), ‘it’ key word, and arrow ‘->’ operator
Kotlin’s built-in .filter() function is meant to iterate through any iterable collection type, (lists, sets, or maps) and check each element of the collection against some criteria (aka “predicate”). If the element matches the predicate, meaning the boolean result is true, then the element is added to a result collection of the same type that … Continue reading Kotlin: How to use .filter( ), ‘it’ key word, and arrow ‘->’ operator
Kotlin: How to understand the not-null assertion operator (!!)
The Kotlin “not-null assertion operator” is expressed as two exclamation points. !! that appear at the end of a variable name. For example: myVariable!! Here is what the Kotlin documentation says about this operator: Here is what I learned about the not-null assertion operator after a little bit of experimentation: The difference between b and … Continue reading Kotlin: How to understand the not-null assertion operator (!!)
Git: How to clear github repo commit history
I had a repo on github that was set to private because the database connection details were exposed in the code. I recently added some code which moved the sensitive database connection details to an outside file so that the repo could be changed from private to public. However, after setting the repo to public … Continue reading Git: How to clear github repo commit history
How to use the Linux od command (Octal Dump)
I was in a command terminal “bash” window on my Mac and I tried to run this curl command to get a security token from a web service api:curl -d “Username=mywebsite&Password=password” -X POST https://dev-warehouseapi.somewebsiteservice.com/api/Token However, my curl command failed with the message “curl: no URL specified!”. For example: My curl command appeared to be perfect, … Continue reading How to use the Linux od command (Octal Dump)
Python and Kotlin: A comparison of the language basics
In this table I will compare some basic programming syntax and conventions between the Python and Kotlin programming languages. Programming element Python Kotlin Commenting code: # This is a comment // This is a comment Multi-line comments: “”” This is a comment. This is a comment, too. This is a comment, too. “”” /* This … Continue reading Python and Kotlin: A comparison of the language basics
MongoDB: How to install mongodb-community on Mac and run on localhost
The goal of this article is to show how to get mongodb-community to run on a Mac at localhost:27017. This assumes that Homebrew has already been installed on your Mac machine. Using a terminal or bash window, start with the following brew command:brew tap mongodb/brew In this screenshot, I used this command after I already … Continue reading MongoDB: How to install mongodb-community on Mac and run on localhost
Kotlin: How to test your code online
Here are some online web apps that people have written that make it possible to test your Kotlin code online. play.kotlinlang.orghttp://play.kotlinlang.org/ JDOODLEhttp://jdoodle.com/ tutorialspointhttps://tutorialspoint.com
Kotlin: How to create a simple Hello World app
When starting on the journey of learning the Kotlin language, it is a good idea to get an initial impression of the language by creating and running the simplest possible program in Kotlin. That is what I will describe how to do in this article. The first step assumes that you have already downloaded and … Continue reading Kotlin: How to create a simple Hello World app