Perl Weekly - all the articles published by Laurent Rosenfeld

2017.05.26 in #305 The 'Think Perl 6' book is out
The Think Perl 6 book is now officially out (see oreilly.com). O'Reilly received it from the printer this week and started shipping it out to retailers.
It is also available in PDF format as a free book under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Readers are free to copy and distribute the text; they are also free to modify it, which allows them to adapt the book to different needs, and to help develop new material. The LaTeX source for this book is in this Github repository.
2019.04.03 in #402 Perl Weekly Challenge, First Week
Laurent Rosenfeld shares his thoughts on the first weekly challenge.
2019.04.07 in #402 Perl 6 Weekly challenge - week 2
2019.04.28 in #405 Perl Weekly Challenge # 5: Anagrams
Laurent Rosenfeld shares his solution with benchmark data.
2019.05.01 in #406 Perl Weekly Challenge # 6: Compact Number Ranges
One of the consistent blogger for Perl Weekly Challenger. Here Laurent shares his ideas and thoughts with regards to his solution for Challenge 006.
2019.05.04 in #406 Perl Weekly Challenge # 6: Ramanujan's Constant
Laurent explains his solution to the second question about Ramanujan's Constant.
2019.05.12 in #407 Perl Weekly Challenge # 7: Niven Numbers and Word Ladders
2019.05.18 in #408 Perl Weekly Challenge # 8: Perfect Numbers and Centered Output
Laurent not only discuss the solution also shares different approach to the same challenge. You will find the solution in both #Perl5 and #Perl6.
2019.05.24 in #409 Perl Weekly Challenge # 9: Squares and Rankings
As always the case with Laurent, you are served with plenty of choices. Each blog of him can easily be turned into chapter in book. Who knows one day, with his permission, I might do that.
2019.05.26 in #409 Perl Weekly Challenge # 9: Square Numbers and Functional Programming in Perl
Laurent wrote another blog talking about the use Functional Programming to solve the challenge. Highly Recommended.
2019.05.29 in #410 Perl Weekly Challenge # 10: Roman Numerals and the Jaro-Winkler Distance
As always, Laurent, shared plenty of variations in his approach. It is always fun reading his blog. He always presents his solutions in both Perl5 and Perl6.
2019.06.05 in #411 Perl Weekly Challenge # 11: Fahrenheit Celsius and Identity Matrix
Laurent's solutions is always looked up by many members as reference point. He is so comfortable with #Perl5 and #Perl6. I can't tell his favourite of both.
2019.06.12 in #412 Perl Weekly Challenge # 12: Euclid's Numbers and Directories
Laurent's blog ideal for anyone wants to learn Perl6. Such a brilliant writing any Perl5 hacker can follow easily.
2019.06.19 in #413 Perl Weekly Challenge # 13: Fridays and Mutually Recursive Subroutines
Laurent's blog is always special and very informative. He not just talks about the challenge solution but also takes you to the edge case and shows how to deal with it.
2019.06.29 in #414 Perl Weekly Challenge # 14: Van Eck's Sequence and US States
2019.07.03 in #415 Perl Weekly Challenge # 15: Strong and Weak Primes and Vigenère Encryption
Laurent is unmatchable in his analysis of challenges. He is great in presenting result of his analysis. At the end it looks so simple and easy.
2019.07.06 in #415 Functional Programming in Perl: Strong and Weak Primes (Perl Weekly Challenge)
Functional programming became a special feature of Laurent blog now a days. I have learnt a lot by reading his blog.
2019.07.08 in #416 Perl Weekly Challenge #16: Pythagoras Pie
Laurent's blog is always fun to read and takes up plenty of time to understand as it covers so many different aspects of the given task.
2019.07.14 in #416 Perl Weekly Challenge #16: Bitcoin Addresses
Laurent's blog about Bitcoin address task is again full of ideas. Read if you want to know more.
2019.07.15 in #417 Perl Weekly Challenge # 17: Ackermann Function and Parsing URLs
You must checkout Perl6 solution of Ackermann function task. Even if you don't know Perl6, you can still enjoy it.
2019.07.24 in #418 Perl Weekly Challenge # 18: Longest Common Substrings, Priority Queues, and a Functional Object System
Laurent starting with simple solution and then moving on sharing String::LCSS solution. The best part of the blog is how he wrote Perl5 solution mimicking Perl6.
2019.07.26 in #418 Perl Weekly Challenge # 18: Priority Queues and Binary Heaps In Perl 6
In this blog, Laurent discussing how Binary Heap can help to solve the Priority Queues task. This itself can be passed the best guide for Binary Heap. Great writing skill, I must admit.
2019.07.29 in #419 Perl Weekly Challenge # 19: Weekends and Wrapping Lines
Laurent back with this intensive analysis. You must checkout his blog first.
2019.08.08 in #420 Perl Weekly Challenge # 20: Split String on Character Change and Amicable Numbers
Laurent is on the case without any issues, following his trademark. He always starts with basic solution and improves the code as he progress further. The journey appears to be so smooth that you wouldn't even realise.
2019.08.13 in #421 Perl Weekly Challenge # 21: Euler's Number and URL Normalizing
Laurent blog starts with Perl6 solution to calculate the value of e, followed by Perl5 equivalent. I was bowled by the Perl5 solution. You must check out.
2019.08.21 in #422 Perl Weekly Challenge # 22: Sexy Prime Pairs and Compression Algorithm
Laurent again showing his expertise in Perl5 and Perl6 with such an ease. It is always enjoyable reading his blog.
2019.08.26 in #423 Perl Weekly Challenge # 23: Difference Series and Prime Factorization
Laurent is one of the busiest members of the team. He not only just does weekly challenge in Perl5 and Perl6 along with blog but also reviews other members Perl6 solutions every week.
2019.09.03 in #424 Perl Weekly Challenge # 24: Smallest Script and Inverted Index
Laurent once again, shared deep analysis of Inverted Index. Highly Recommended.
2019.09.10 in #425 Perl Weekly Challenge 25: Pokémon Sequence and Chaocipher
Laurent would never let you down. This time also he came up with ground up solutions.
2019.09.16 in #426 Perl Weekly Challenge 26: Common Letters and Mean Angles
Laurent solution to the Mean Angles task is amazingly easy and simple to follow with unit test.
2019.09.29 in #427 Perl Weekly Challenge 27: Intersection Point and Historical Values
Laurent's blog is like reading a book, comprehensive analysis of each tasks.
2019.10.05 in #428 Perl Weekly Challenge 28: File Type and Digital Clock
Laurent shared nice little background of file type checking. I liked how he dealt in Perl6. You can't afford to miss it.
2019.10.13 in #429 Perl Weekly Challenge 29: Brace Expansion and Calling C Code
Laurent blog is something you can't afford to miss. You must checkout.
2019.10.14 in #430 Perl Weekly Challenge 30: Sunday Christmas and Triplets
Please checkout the Raku magic to solve the Christmas date task. You will be amazed.
2019.10.24 in #431 Perl Weekly Challenge 31: Illegal Division by Zero and Dynamic Variables
Laurent blog, as always, started with easy one-liners solution then expanded into full solution. Highly Recommended.
2019.10.30 in #432 Perl Weekly Challenge 32: Word Histogram and ASCII Bar Chart
Laurent special this week is Raku solution imho. Please check out.
2019.11.06 in #433 Perl Weekly Challenge 33: Count letters and Multiplication Tables
I really enjoyed reading Laurent's blog. Being an author, he knows how to build story around the solution.
2019.11.11 in #434 Perl Weekly Challenge 34: Array and Hash Slices and Dispatch Tables
If you think, you know Array/Hash slice then I suggest you read the blog as Laurent tends to take you on fun journey every week.
2019.11.22 in #435 Perl Weekly Challenge 35: Binary Encoded Morse Code
Laurent is absolute genious when it comes to Perl and Raku. Must Read.
2019.12.01 in #436 Perl Weekly Challenge 36: Vehicle Identification Numbers (VIN) and the Knapsack Problem
Reading Laurent's blog makes you want more. I can't stop reading his blog again and again.
2019.12.07 in #437 Perl Weekly Challenge 37: Week Days in Each Month and Daylight Gain/loss
I am a big fan of Laurent writing skill and his analytical skill. He is simply the best.
2019.12.12 in #438 Day 12 - nth Order Difference Series
2019.12.15 in #438 Perl Weekly Challenge 38: Date Finder and Word Game
Laurent used Raku Grammar to solve this week challennge. Please checkout.
2019.12.19 in #439 Perl Weekly Challenge # 39: Guest House and Reverse Polish Notation
Laurent has been contributing to the weekly challenge for a long. The quality is always top level.
2019.12.26 in #440 Perl Weekly Challenge 40: Multiple Arrays Content and Sublist Sorting
Laurent blog is a mini book in itself. Highly Recommended.
2020.01.01 in #441 Perl Weekly Challenge 41: Attractive Numbers and Leonardo Numbers
Laurent used lazy list of Raku to solve Attractive number task. You will find plenty more magic like this.
2020.01.05 in #441 Raku Review - Perl Weekly Challenge - 040
Raku Solutions Review by Laurent Rosenfeld.
2020.01.08 in #442 Perl Weekly Challenge 42: Octal Numbers and Balanced Parentheses
Laurent do not need any introduction. If you are looking for analytical explanation then please do check out the blog.
2020.01.10 in #442 Think Raku - Released
Laurent announced updated version of original book "Think Perl6" but since Perl 6 has been renamed Raku, they have also changed the title of the book.
2020.01.12 in #442 Raku Review - Perl Weekly Challenge - 041
Raku Solutions Review by Laurent Rosenfeld.
2020.01.19 in #443 Perl Weekly Challenge 43: Olympic Rings and Self-Descripting Numbers
Laurent is one of the highly regarded member. You get to learn so much about the subject.
2020.01.20 in #443 Raku Review - Perl Weekly Challenge - 042
Raku Solutions Review by Laurent Rosenfeld.
2020.01.26 in #444 Perl Weekly Challenge 44: Only 100, Please, and Make it $200
2020.02.01 in #445 Perl Weekly Challenge 45: Square Secret Code and Source Dumper
Laurent always comes up with plenty of solutions. Highly Recommended.
2020.02.09 in #446 Perl Weekly Challenge 46: Garbled Message and Room Open
Laurent analysis of the room task really made my day. Highly Recommended.
2020.02.20 in #448 Perl Weekly Challenge 48: Survivor and Palindrome Dates
Laurent shared generic survivor task solution. You won't get bored of reading his blog.
2020.02.28 in #449 Perl Weekly Challenge: Smallest Multiple and LRU Cache
Laurent once again came up with Functional Programming to solve the LRU cache task. Hight Recommended.
2020.03.08 in #450 Perl Weekly Challenge: Merge Inrervals and Noble Numbers
Laurent shared the power of Raku when solving Noble number task.
2020.03.15 in #451 Perl Weekly Challenge: sums
For the first time, Laurent only managed to do 3 Sum task in Raku.
2020.03.22 in #452 Perl Weekly Challenge: Stepping Numbers and Lucky Winner
As always, if you want to learn new interesting feature, don't forget to checkout his blog. Must Read.
2020.03.28 in #453 Perl Weekly Challenge 53: Rotate Matrix and Vowel Strings
Laurent shared the trick to solve the rotate matrix.
2020.03.29 in #453 Raku Review - Perl Weekly Challenge - 052
Raku Solutions Review by Laurent Rosenfeld.
2020.04.04 in #454 Perl Weekly Challenge 54: k-th Permutation Sequence and the Collatz Conjecture
Laurent solved the challenge without the help of CPAN. Highly Recommended.
2020.04.12 in #455 Perl Weekly Challenge 55: Binary Numbers and Wave Arrays
Laurent's make difficult task looks simple. Checkout his blog to find out yourself.
2020.04.16 in #456 Revisiting the Collatz Sequence (PWC 54)
Laurent revisited his work on Collatz Sequence and shared his findings.
2020.04.18 in #456 Perl Weekly Challenge # 56: Diff-k and Path Sum
Laurent's analytics discussion is unmatchable. Highly Recommended.
2020.04.22 in #457 Raku Review - Perl Weekly Challenge - 054
Raku Solutions Review by Laurent Rosenfeld.
2020.04.26 in #457 Perl Weekly Challenge 57: Tree Inversion and Shortest Unique Prefix
The best part to me was "Tree Inversion Using a Flat Array". A very interesting approach.
2020.05.01 in #458 # Perl Weekly Challenge 58: Compare Versions and Ordered Lineup
Laurent's solution to the compare version is really cool in my opinion.
2020.05.07 in #459 Raku Review - Perl Weekly Challenge - 056
Raku Solutions Review by Laurent Rosenfeld.
2020.05.07 in #459 Raku Review - Perl Weekly Challenge - 057
Raku Solutions Review by Laurent Rosenfeld.
2020.05.10 in #459 Perl Weekly Challenge 59: Linked Lists and Bit Sums
As always Laurent shared multiple solutions to each task. Highly Recommended.
2020.05.17 in #460 Perl Weekly Challenge 60: Excel Columns and Find Numbers
You don't want to miss the Excel Column solution by Laurent. Mind Blowing.
2020.05.21 in #461 Perl Weekly Challenge 61: Max Subarray Product and IP Address Partition
Laurent shared few Raku magics in his blog. You don't want to missed them.
2020.05.31 in #462 Perl Weekly Challenge 62: Sort Email Addresses
Laurent shared various approach to solve Sort Email Addresses task in Perl and Raku.
2020.06.02 in #463 Perl Weekly Challenge 63: Last Word and Rotate String
Laurent took the easiest route to solve Last Word task, yet very elegant as always.
2020.06.14 in #464 Perl Weekly Challenge 64: Minimum Sum Path and Word Break
Laurent shared the power of Perl and Raku equally.
2020.06.28 in #466 Perl Weekly Challenge 66: Divide Integers and Power Integers
Laurent shared his Raku magic one more time.
2020.07.04 in #467 Perl Weekly Challenge 67: Number Combinations and Letter Phone
I simply love the varieties of solutions both in Perl and Raku.
2020.07.06 in #467 Raku Review - Perl Weekly Challenge - 058
Raku Solutions Review by Colin Crain.
2020.07.18 in #469 Perl Weekly Challenge 69: Strobogrammatic Numbers and 0/1 Strings
Laurent analysis of 0/1 String task is quite interesting. Checkout yourself.
2020.07.26 in #470 Perl Weekly Challenge 70: Character Swapping and Gray Code Sequence
Thanks Laurent for sharing postcircumfix example.
2020.08.02 in #471 Perl Weekly Challenge 71: Peak Elements and Trim Linked List
Laurent showing us the power of gather in Raku.
2020.08.09 in #472 Perl Weekly Challenge 72: One-Liners for Trailing Zeros and Line Ranges
Laurent went beyond solving the task and shared the various different aspects of the task.
2020.08.11 in #473 Perl Weekly Challenge 73: Min Sliding Window and Smallest Neighbor
Laurent used gather/take combination to solve Min Sliding Window task. Interesting Take.
2020.08.23 in #474 Perl Weekly Challenge 74: Majority Element and FNR Character
Like always, Laurent packed plenty of Raku magic in his blog.
2020.08.28 in #475 Perl Weekly Challenge 75: Coin Sums and Largest Rectangle Histogram
Laurent special skill of breaking task into smaller task makes difficult task looks easy. He did it one more time.
2020.09.07 in #476 Perl Weekly Challenge 76: Letter Grid
Laurent skipped "Prime Sum" task because of lack of time. However he did manage to get the "Word Search" task done on time.
2020.09.10 in #477 Perl Weekly Challenge: Fibonacci Sum and Lonely X
Laurent as always discussed the nitty-gritty on Fibonacci sum task.
2020.09.16 in #478 Perl Weekly Challenge 78: Leader Element and Left Rotation
Laurent as always made the task looks like school boy task. Perl and Raku solutions are equally cool.
2020.09.23 in #479 Perl Weekly Challenge 79: Count Set Bits and Trapped Rain Water
As always, Laurent mix bag of Perl and Raku is worth reading. Highly Recommended.
2020.09.29 in #480 Perl Weekly Challenge 80: Smallest Positive Number Bits and Count Candies
Check out this mix of Perl and Raku solutions.
2020.10.11 in #481 Perl Weekly Challenge 81: Frequency Sort
Laurent shared Frequency Sort task analysis.
2020.10.18 in #482 Perl Weekly Challenge 82: Common Factors
Laurent continued his weekly blog without interruption,
2020.10.24 in #483 Perl Weekly Challenge 83: Words Length and Flip Array
Laurent came up with yet another gem of solutions.
2020.10.27 in #484 Perl Weekly Challenge 84: Reverse Integer and Find Square Matrices
Laurent's blog has been inspirational to all new members of PWC. Great work, keep it up.
2020.11.07 in #485 Perl Weekly Challenge 85: Triplet Sum and Power of Two Integers
Laurent, as always, shows the power of Perl and Raku in great detail handling both tasks of the week.
2020.11.15 in #486 Perl Weekly Challenge 86: Pair Differences and Sudoku Puzzles
Laurent's explanation of the Sudoku puzzle is the best introduction to the problem.
2020.11.19 in #487 Perl Weekly Challenge 87: Longest Consecutive Sequences and Largest Rectangle
Laurent's thorough discussion about different types of sorting. You even get to know about Functional programming.
2020.11.25 in #488 Perl Weekly Challenge 88: Array of Products and Spiral Matrices
Laurent writing Raku first then porting the code to Perl is really cool. His contributions in Perl and Raku are equally great.
2020.12.06 in #489 Perl Weekly Challenge 89: GCD Sums and Magic Squares
Laurent is one of the few who have been associated with the weekly challenge from day one and you see he is still as refresh as he was on day one. Unmatched skill.
2020.12.08 in #490 Perl Weekly Challenge 90: DNA Sequence and Ethiopian Multiplication
Laurent once again came up with compact solutions. You even get a bonus Scala solution this time.
2020.12.15 in #491 Perl Weekly Challenge 91: Count Numbers and Jump Games
Enjoy the flavour of Scala along with Perl and Raku. 3-in-1 blog post, great.
2020.12.27 in #492 Perl Weekly Challenge 92: Isomorphic Strings and Insert Intervals
Like always, Laurent discuss all the possible ways of dealing with the task. Must Read.
2021.01.02 in #493 Perl Weekly Challenge 93: Max Points and Sum Path
Laurent is never short of choices. Every task has multiple choices for you to see the differences. Must Read.
2021.01.06 in #494 Perl Weekly Challenge 94: Group Anagrams and Binary Tree to Linked List
Laurent has yet another detailed descriptive blog post for both Perl and Raku. Highly Recommended.
2021.01.14 in #495 Perl Weekly Challenge 95: Palindrome Numbers and Demo Stack
Thank you, Laurent for being a great supporter. As always, he showed both functional and object oriented approaches.
2021.01.22 in #496 Perl Weekly Challenge 96: Reverse Words and Edit Distance (and Decorators in Perl)
Laurent is teaching us the decorator pattern in Perl this week. You don't want to miss this.
2021.01.31 in #497 Perl Weekly Challenge 97: Caesar Cipher and Binary Substrings
Laurent's blog is, as always, full of magic - whether it is Perl or Raku.
2021.02.08 in #498 Perl Weekly Challenge 98: Read N-Characters and Search Insert Position
A last-minute submission by Laurent is well worth the wait. Plenty of choices dealing with the readN() task.
2021.02.12 in #499 Perl Weekly Challenge 99: Pattern Match and Unique Subsequence
Laurent's discussion of his Perl and Raku solutions contains great inside stories from both worlds. Highly Recommended.
2021.02.21 in #500 Perl Weekly Challenge 100: Fun Time and Triangle Sum
Laurent's modular approach is always very elegant. Thanks for sharing.
2021.03.16 in #504 Perl Weekly Challenge 104: Fusc Sequence and NIM Game
Laureent is back with a bang and this time you get guest contributions too.
2021.03.26 in #505 Perl Weekly Challenge 105: Nth Root and The Name Game
Laurent kept it simple and easy this time. We even got a bonus solution in Python.
2021.04.02 in #506 Perl Weekly Challenge 106: Maximum Gap and Decimal String
Laurent showing his expertise in multiple languages in this blog post. Incredible.
2021.04.05 in #507 Perl Weekly Challenge 107: Self-Descripting Numbers and List Methods
Laurent presented a complete solution for the Self-descriptive numbers task, you don't want to miss out.
2021.04.13 in #508 Perl Weekly Challenge 108: Locate Memory and Bell Numbers
Laurent is on a mission to show his skill. Plenty of choices of languages can be found in this blog post.
2021.04.21 in #509 Perl Weekly Challenge 109: Chowla Numbers and Four Square Puzzle
Laurent seems to read my mind, smart brain. He correctly guessed that the output is not part of the requirements. Thank You.
2021.05.01 in #510 Perl Weekly Challenge 110: Valid Phone Numbers and Transposed File
Laurent has been consistently sharing solutions in more than just Perl and Raku. Thanks for sharing.
2021.05.05 in #511 Perl Weekly Challenge 111: Search Matrix and Ordered Letters
As always Lauarent came up a with detailed analysis and presented his solutions in Perl and Raku.
2021.05.13 in #512 Perl Weekly Challenge 112: Canonical Path and Climb Stairs
Laurent shared something new - try-steps for the Climb Stairs task. Thanks for sharing the magic of Raku.
2021.05.26 in #514 Perl Weekly Challenge 114: Next Palindrome Number and Higher Integer Set Bits
For me the USP of Laurent's blog post is to see the comparison of his Perl and Raku implementations. You don't want to miss the discussion.
2021.06.12 in #516 Perl Weekly Challenge 116: Number Sequence and Sum of Squares
Laurent's blog is always very special as there are plenty of ideas to explore. Please check out the Raku tricks.
2021.06.19 in #517 Perl Weekly Challenge 117: Missing Row and Possible Paths
Laurent presented us with short and precise solutions this week, specially the solution to the Find Possible Paths task. He made it look so simple. Great work, thanks for sharing.
2021.06.23 in #518 Perl Weekly Challenge 118: Binary Palindrome
I really admire the dedication of Laurent as he managed to find time to solve the task. Well done.
2021.07.01 in #519 Perl Weekly Challenge 119: Swap Nibbles and Sequence without 1-on-1
2021.07.09 in #520 Perl Weekly Challenge 120: Swap Odd/Even Bits and Clock Angle
Laurent never misses an opportunity to show off his Raku knowledge. I have learnt a lot from him. Keep sharing.
2021.07.17 in #521 Perl Weekly Challenge 121: Invert Bit
Laurent only attempted the Invert Bit task as he was too busy with his other commitments. Glad he shared the blog post with us. Thanks.
2021.07.20 in #522 Perl Weekly Challenge 122: Average of Stream and Basketball Points
2021.07.31 in #523 Perl Weekly Challenge 123: Ugly Numbers and Square Points
Laurent's solution to the Ugly Numbers task is very impressive. Thank you for sharing your experience with us.
2021.08.03 in #524 Perl Weekly Challenge 124: Happy Women Day and Tug of War
Laurent seems to be on the loose this week. He gave a tough fight to Abigail with his guest contributions to task #1. Having said that, his Perl solution to Tug of War is something to watch out for. You don't want to miss it.
2021.08.15 in #525 Perl Weekly Challenge 125: Pythagorean Triples
Laurent had a busy week, but still managed to get one task done at least. I salute his dedication. Keep it up.
2021.08.19 in #526 Perl Weekly Challenge 126: Count Numbers and Minesweeper Game
Laurent has been sharing Perl and Raku solutions every week for months now. If you ever want to learn how to port a Raku solution to Perl then this is the best place to look. Thanks for sharing.
2021.08.29 in #527 Perl Weekly Challenge 127: Disjoint Sets and Conflict Intervals
Cute and short solutions in Perl and Raku. Thanks for sharing.

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