Re: How to delete few elements from array beginning?

From: Alexander Farber <alexander(dot)farber(at)gmail(dot)com>
To:
Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: How to delete few elements from array beginning?
Date: 2016-03-09 15:53:54
Message-ID: CAADeyWhpTjqPJOqrcv2yXCBnHSTLA8V679Y2q5-RYi5fuA-UJg@mail.gmail.com
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Hello Chris,

On Wed, Mar 9, 2016 at 4:42 PM, Chris Travers <chris(dot)travers(at)gmail(dot)com>
wrote:

>
>
> On Wed, Mar 9, 2016 at 1:10 PM, Alexander Farber <
> alexander(dot)farber(at)gmail(dot)com> wrote:
>
>>
>> what is please the most efficient way to delete a slice from the start of
>> a longer array (after I have copied it to another array)?
>>
>> Do I really have to copy a large slice of the array to itself, like in
>> the last line here:
>>
>> pile_array := pile_array || swap_array;
>>
>> /* here I copy away swap_len elements */
>> new_hand := pile_array[1:swap_len];
>>
>> /* here I don't know how to efficiently remove already copied
>> elements */
>> pile_array := pile_array[(swap_len + 1):ARRAY_LENGTH(pile_array,
>> 1)];
>>
>> or is there a better way?
>>
>
> This looks like something for card hands?
>
> What you are doing seems correct to me.
>
>
actually card hands would be easier - because cards are unique in the deck.

But here I have letter hands (like "AAABCDE") in a word game and they are
not unique in the pile...

Regards
Alex

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