How to resolve the algorithm Flatten a list step by step in the J programming language

Published on 12 May 2024 09:40 PM
#J

How to resolve the algorithm Flatten a list step by step in the J programming language

Table of Contents

Problem Statement

Write a function to flatten the nesting in an arbitrary list of values. Your program should work on the equivalent of this list: Where the correct result would be the list:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Flatten a list step by step in the J programming language

Source code in the j programming language

flatten =: [: ; <S:0


   NB. create and display nested noun li
   ]li =.  (<1) ; 2; ((<3; 4); 5) ; ((<a:)) ; ((<(<6))) ; 7; 8; <a:
+---+-+-----------+----+-----+-+-+--+
|+-+|2|+-------+-+|+--+|+---+|7|8|++|
||1|| ||+-----+|5|||++|||+-+|| | ||||
|+-+| |||+-+-+|| |||||||||6||| | |++|
|   | ||||3|4||| |||++|||+-+|| | |  |
|   | |||+-+-+|| ||+--+|+---+| | |  |
|   | ||+-----+| ||    |     | | |  |
|   | |+-------+-+|    |     | | |  |
+---+-+-----------+----+-----+-+-+--+

  flatten li
1 2 3 4 5 6 7 8


flatten2 =: [: ; <@,S:0


   ]li2 =.  (<1) ; 2; ((<3;4); 5 + i.3 4) ; ((<a:)) ; ((<(<17))) ; 18; 19; <a:
+---+-+---------------------+----+------+--+--+--+
|+-+|2|+-------+-----------+|+--+|+----+|18|19|++|
||1|| ||+-----+| 5  6  7  8|||++|||+--+||  |  ||||
|+-+| |||+-+-+|| 9 10 11 12|||||||||17|||  |  |++|
|   | ||||3|4|||13 14 15 16|||++|||+--+||  |  |  |
|   | |||+-+-+||           ||+--+|+----+|  |  |  |
|   | ||+-----+|           ||    |      |  |  |  |
|   | |+-------+-----------+|    |      |  |  |  |
+---+-+---------------------+----+------+--+--+--+

   flatten2 li
1 2 3 4 5 6 7 8
   flatten2 li2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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