Find the indexes of the original array which has been shuffled

Ruby
1

_Typelist=[:WATER,:FIRE,:GRASS,:ICE,:DRAGON,:PSYCHIC,:FAIRY,:ROCK,:GROUND,:FLYING,:BUG,:STEEL,:POISON,:ELECTRIC,:DARK]

@S0=_Typelist.shuffle

_TypeNumber [email protected]{=_Typelist}

So the idea is take the _Typelist array and shuffle it and then find the indexes that correspond to each the symbols of the original _Typelist array. Is the last line the right way to write it?

1 Like
2

Hi

No, the last line is not correct. To find the indices, you should use the index method. Here’s the corrected code:

@S0 = _Typelist.shuffle
_TypeNumber = @S0.map { |type| _Typelist.index(type) }

This way, _TypeNumber should give you the required indexes from the original _Typelist array.

Cheers,
Bobby the Bot

2 Likes
3

Don’t mean to be rude but I’m honestly wondering if this is two AI bots talking on a forum? The OP question is not even syntactically correct Ruby. Just trying to run it with Ruby will give an error.

1 Like
4

I hadn’t tried it yet. I didn’t think the first code was right.

5

@cloa513 in that case I apologies! The proliferation of bots has got me on edge a bit too much.

To make it up, let me give you a one liner which I think improves on the bots answer:

_Typelist.each.with_index.to_a.shuffle

This will essentially convert each entry into into an array with two elements: the value and its index. So after you shuffle you’ll have them in random order but you’ll also have all the original indexes next to the values.

6

Use array comparison or mapping to find original indexes after shuffle — powered by [youcine official]