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DataWeave programming challenge #5: Reverse a phrase's words, but keep the punctuation



 

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This challenge is based on Codeacademy's Reverse Words challenge

Try to solve this challenge on your own to maximize learning. We recommend you refer to the DataWeave documentation only. Try to avoid using Google or asking others so you can learn on your own and become a DataWeave expert!




Input


Consider the following input payload (can be of txt format):


Hello world
May the Fourth be with you
Hello world!
With you, be May the Fourth
With you, be May the Fourth!


Explanation of the problem


Create a DataWeave script that will reverse the order of each one of the words in a phrase to form a new phrase. Each phrase or sentence is separated by a new line. Each word is separated by a space. However, the punctuation signs (! and ,) will have to stay in the same place. Lower/upper cases can be kept as-is.


For example:

  • "Hello world!" becomes "world Hello!"

  • "With you, be May the Fourth!" becomes "Fourth the, May be you With!"



Expected output


In this case, the expected output would be:


[
  "world Hello",
  "you with be Fourth the May",
  "world Hello!",
  "Fourth the, May be you With",
  "Fourth the, May be you With!"
]

ℹ️ Note: You can keep the output as a JSON or as a text, whatever your preference is.



Clues


If you're stuck with your solution, feel free to check out some of these clues to give you ideas on how to solve it!


Clue #1

Clue #2

Clue #3

Clue #4



Answer


If you haven't solved this challenge yet, we encourage you to keep trying! It's ok if it's taking longer than you thought. We all have to start somewhere ✨ Check out the clues and read the docs before giving up. You got this!! 💙


There are many ways to solve this challenge, but you can find here my solution. I'm sure you all can make it better! :) Mine is super long 😂


Solution #1


I also recorded myself coming up with the solution, but without explanations. Just some lo-fi music and a screen :) you can leave the video in the background while working! :D let me know if you find this useful.



Feel free to comment your code below for others to see! 😄


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965 views13 comments

13 comentários


My approach 🤓


%dw 2.0 import * from dw::core::Strings output application/json fun extract(text)= do { var list= words(text) var punc= list map (if(isAlphanumeric($)) "" else $[-1]) var rev= list[-1 to 0] map ((if(isAlphanumeric($)) $ else $[0 to -2]) ++ punc[$$]) --- rev joinBy(" ") } --- payload splitBy("\n") map (line,key)-> extract(line)

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Alex Martinez
Alex Martinez
30 de ago. de 2023
Respondendo a

noice!! thank you for sharing!

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Felix Schnabel
Felix Schnabel
18 de abr. de 2023

My solution: https://gist.github.com/Shadow-Devil/c579da4418b135bd67869437bf999653

My first approach was wrong, I just inserted the special chars at the exact index where they were before 😂 So "a, bc" would be "b,c a" what's wrong of course

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Felix Schnabel
Felix Schnabel
18 de abr. de 2023
Respondendo a

I've updated it 😄

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Felix Schnabel
Felix Schnabel
18 de abr. de 2023
Respondendo a

Damn, that solution is so nice. I was kinda thinking in that direction but couldn't write it down

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raju kr
raju kr
18 de abr. de 2023

%dw 2.0 output application/json var convert=((payload as String) splitBy ("\n")) map ((item, index) -> (item) ) --- convert map ((item, index) -> (item splitBy (" ") )[-1 to 0] joinBy (" ") )

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Alex Martinez
Alex Martinez
18 de abr. de 2023
Respondendo a

This is not the right answer :( Make sure you check the expected output!

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Elvedin Babic
Elvedin Babic
18 de abr. de 2023

splitBy(payload,"\n") -map

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Alex Martinez
Alex Martinez
18 de abr. de 2023
Respondendo a

That's not the right answer, sorry. You're not reversing the order of the words

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