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Challenges Determine whether an integer is square-free

Myby, 12 5 bytes primf=primfd primf : prime factors = : equals primfd : unique prime factors Evaluated as a monadic fork in J (f y) g (h y). The test cases (retest...

posted 2y ago by south‭  ·  edited 2y ago by south‭

Answer
#2: Post edited by user avatar south‭ · 2022-08-20T06:15:21Z (about 2 years ago)
  • # [Myby](https://github.com/ConorOBrien-Foxx/Myby), 12 bytes
  • ```
  • (0<<.)##%(#*#)O"2&R
  • ```
  • ```
  • < : less than
  • <. : minimum
  • # : identity
  • % : modulus
  • * : multiplication
  • O : fork
  • " : map
  • 2&R: bond 2 to dyadic range, 2..
  • ```
  • The evaluation order using a fancy schmancy tree, where `Ψ` represents a fork from J and `@` represents atop from APL, looks like
  • ```
  • (0<<.)##%(#*#)O"2&R
  • ┌─ 0
  • ┌─ Ψ ─┼─ <
  • │ └─ <.
  • │ ┌─ #
  • │ │ ┌─ #
  • ─ @ ─┤ │ ├─ %
  • │ ├─ " ─── O ─┤ ┌─ #
  • └─ Ψ ─┤ └─ Ψ ─┼─ *
  • │ └─ #
  • │ ┌─ 2
  • └─ & ─┴─ R
  • ```
  • The test cases can be viewed [here](https://files.catbox.moe/zoje97.txt) and were generated using [this ruby script](https://files.catbox.moe/jyuigf.rb).
  • # [Myby](https://github.com/ConorOBrien-Foxx/Myby), ~~12~~ 5 bytes
  • ```
  • primf=primfd
  • ```
  • ```
  • primf : prime factors
  • = : equals
  • primfd : unique prime factors
  • ```
  • Evaluated as a monadic fork in J `(f y) g (h y)`.
  • The test cases (retested) can be viewed [here](https://files.catbox.moe/4t2r72.txt) and were generated using [this ruby script](https://files.catbox.moe/jyuigf.rb).
#1: Initial revision by user avatar south‭ · 2022-08-17T06:12:16Z (about 2 years ago)
# [Myby](https://github.com/ConorOBrien-Foxx/Myby), 12 bytes
```
(0<<.)##%(#*#)O"2&R
```
```
<  : less than
<. : minimum
#  : identity
%  : modulus
*  : multiplication
O  : fork
"  : map
2&R: bond 2 to dyadic range, 2..
```
The evaluation order using a fancy schmancy tree, where `Ψ` represents a fork from J and `@` represents atop from APL, looks like 
```
(0<<.)##%(#*#)O"2&R

           ┌─ 0
     ┌─ Ψ ─┼─ <
     │     └─ <.
     │
     │     ┌─ #
     │     │           ┌─ #
─ @ ─┤     │           ├─ %
     │     ├─ " ─── O ─┤     ┌─ #
     └─ Ψ ─┤           └─ Ψ ─┼─ *
           │                 └─ #
           │
           │     ┌─ 2
           └─ & ─┴─ R
```
The test cases can be viewed [here](https://files.catbox.moe/zoje97.txt) and were generated using [this ruby script](https://files.catbox.moe/jyuigf.rb).