📘 String length in Perl 6

Print the length of a string. Perl 6 handles all strings as UTF-8 by default. This is why there is more than one parameter describing the length of the string. In fact, the lengthroutine does not exist, and an attempt to use it issues an error message with some hints to which other methods you can … Continue reading “📘 String length in Perl 6”

📘 Greet a person using Perl 6

Ask a user for their name and greet them by printing ‘Hello, <Name>!’ Perl 6 offers a simple promptfunction that performs both actions: prints a prompt and reads the input. So, the program using it may look like this: say ‘Hello, ‘ ~ prompt(‘Enter your name: ‘) ~ ‘!’; The ~operator stands for string concatenation in Perl 6. Don’t … Continue reading “📘 Greet a person using Perl 6”

📘 Hello, World! in Perl 6

Print ‘Hello, World!’ There are two built-in functions in Perl 6 to print to the console: printand say. Both print their arguments, but the say routine additionally ends the output with a newline character. So, the quickest solution is to use sayand pass a string with no newlines: say ‘Hello, World!’ Another solution is to use print and include the \n character … Continue reading “📘 Hello, World! in Perl 6”

📘 How to debug Perl 6 programs

For quick tests, use the compiler in the mode of the REPL (read—eval—print loop) shell. Just run the perl6 command: $ perl6To exit type ‘exit’ or ‘^D’>  With bigger programs, one of the following techniques helps to visualise data: 1. The say routine is used as a stand-alone function or as an object method. It works well … Continue reading “📘 How to debug Perl 6 programs”

🦋 109. 42 via the cubes

In the recent days, you might have seen the calculation that leads to getting an exact value of 42, the answer of Life, the Universe and Everything. Let me copy it here, using the power of Perl 6 and its arbitrary precision arithmetics , not to mention the coolness of using superscripts directly in the … Continue reading “🦋 109. 42 via the cubes”

🦋 108. Basic usage of NativeCall in Perl 6

NativeCall is both a module and a technology in Perl 6 that allows you to call C functions from your Perl 6 code. Today, let’s meet the most basic usage. Take the rand() function from the C standard library: #include <stdio.h> #include <stdlib.h> int main() { int r = rand(); printf(“%i\n”, r); return 0; } … Continue reading “🦋 108. Basic usage of NativeCall in Perl 6”

💡 107. Odd-even sort in Perl 6

In the Odd-Even sort, or Brick sort, you take every second element and swap it with the next one if they are not sorted. Then you take the same elements and swap it with the previous element if they are not ordered. You continue until you are done. You can formulate the algorithm a bit … Continue reading “💡 107. Odd-even sort in Perl 6”

💡 106. Gnome sort in Perl 6

Our today’s topic is the Gnome sort, which is also referred to as Stupid sort. To sort an array using this method, you scan the data from left to right and check the two adjacent items to see if they are ordered properly. If they are, you go forward. If not, you swap the elements … Continue reading “💡 106. Gnome sort in Perl 6”

💡 105. Pancake sort in Perl 6

The Pancake sort is an interesting method of sorting data, as unlike more traditional sorting algorithms, it operates with piles of data on each step. You have to imagine data as a pile of pancakes, the values corresponding to the size of pancakes. The only allowed operation is flipping a pile of ‘pancakes.’ It can … Continue reading “💡 105. Pancake sort in Perl 6”

💡 104. Stooge sort in Perl 6

Have you ever heard of the Stooge sort algorithm? If not, it is quite interesting to learn it. The idea is clear, while you maybe need some time to see if it really works. So, take a list of numbers and swap the first and the last elements if they are not sorted properly (that … Continue reading “💡 104. Stooge sort in Perl 6”