# Tag: Kotlin

• ## Solving the Daily Jumble

Recently I decided to subscribe to my local newspaper (the Hartford Courant, pronounced current) again. That’s been valuable by itself, and brought some benefits I forgot about (like a comics page), but one of the unexpected side effects has been the Daily Jumble. The idea is to unscramble the clues to form words. All of…

• ## Antarctica Time Zones in Kotlin on GraalVM

They say you can tell someone is a developer by whispering the word “timezone” in their ear and watching a shudder go down their spine. Here, from Wikipedia, is a picture of the time zones in Antarctica. Amazing, right? But the funny part isn’t immediately obvious. See how the South Pole is inside that hashed…

• ## A Few Astronomical Examples in Kotlin

The website Open Notify provides a few URLs that return JSON data from NASA. There are currently three links supported: Number of people in space Current location of the International Space Station Overhead pass predictions for the ISS Just for fun, this blog post uses Kotlin to access each one, transform the results in Kotlin…

• ## Fibonacci in Kotlin

I didn’t realize it until I noticed the trending topic on Twitter, but Saturday, November 23 was Fibonacci Day. That gave me an opportunity to drag out one of my favorite old jokes: For those unaware or who don’t remember, the Fibonacci series starts with 0 and 1, and then each subsequent number is the…

• ## Annotated TOC for Kotlin Cookbook

Last week I received an email asking about a table Of contents for my new Kotlin Cookbook, saying they couldn’t find one either on the O’Reilly Media site or on Amazon. It’s a lot easier to make a decision about buying a recipe book if you have a list of recipes. When I checked last…

• ## Kotlin Palindrome Checker

This post, based on code from my new Kotlin Cookbook, shows how to write a palindrome checker in Kotlin. Along the way it discusses raw strings and regular expressions, writing functions as single statements, and creating an extension function on String. First, a quick definition. A palindrome is a string whose characters are the same…

• ## A Deep Dive into the KotlinVersion Class

Getting the current Kotlin version is easy, but the actual KotlinVersion class is much more interesting. This post shows how to get the Kotlin version programmatically, but then looks at the details of the KotlinVersion class, including how it demonstrates a great way to write an equals method and more. Note that this demo is…