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A beginner's tutorial on using Git and GitLab
Jan 1, 20224 min read
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50 Ways You Can Improve as a Programmer
I have been a professional programmer for over 30 years. Programming is a lifelong journey of learning, practice, and improvement. During my career, I have found different ways to improve my programming skills. I often share tips on Twitter. Here are...
Nov 28, 202111 min readTutorial: Accepting String Input in Java
Some Java programs need input from the user. To accept input from the user, use the Scanner class. The Scanner class has methods that accept different types of input. This tutorial describes string input. First, import the Scanner class at the top of...
Nov 9, 20213 min readHow-To: Java charAt() String Function
A string is a sequence of characters. Sometimes we need to access a character in the string. The Java String function charAt() returns the character at a given position in a string. Here is an example. First, we create a string in Java: String s = "T...
Nov 9, 20212 min readHow-To: Java isDigit() Character function
Sometimes it is helpful to know if a character is a digit (0-9) or not. The Java built-in Character class provides an isDigit() function that determines if a character is a digit or not. Here is an example. First, here are two character values to tes...
Nov 9, 20212 min readJava Tip: What are Methods, Functions, and Procedures?
Methods 🦁, Functions 🐯, and Procedures 🐻, Oh My! Programmers often use these terms interchangeably. But there are differences among them. The following paragraphs describe methods, functions, and procedures in Java. Methods A method in Java is a s...
Nov 9, 20212 min readTutorial: Write Your First JavaScript Program
JavaScript programs execute in the browser. That means you need an HTML document. Here is a simple one to start with: <!DOCTYPE html> <html lang="en"> <head> <title>My document</title> </head> <body> </body> </html> That is a very basic HTML docum...
Nov 9, 20211 min readHow-To: Formatting Java Output With printf()
The Java System.out.printf() method formats and outputs a string. You specify the data and the format of the output. The examples below demonstrate different ways to use printf() to format output. To output a single string value, use the %s format: S...
Nov 9, 20214 min readAn Algorithm to Translate Vanity Phone Numbers
Background How would you translate a vanity phone number like 1 800 RED CROSS to its actual phone number: 1-800-733-2767? If you're dialing the number on a phone ☎️, you just find the letters on the keypad and press the corresponding numbers. However...
Nov 9, 20212 min read