valueDiff for arrays?

[J. Landman Gay]

I think "filter" is culinary enough. Coffee filters do the same thing, only 
they filter without. :)

--
Jacqueline Landman Gay | jacque at hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
On August 5, 2018 11:53:11 AM Mark Waddingham via use-livecode 
<use-livecode at lists.runrev.com> wrote:

> Well...
>
> strain X through Y
>
> Does kind of work - although it still doesn't explicitly relate what is to 
> be kept (which is implicit in context in a recipe) and that's the 
> deficiency in the current syntax.
>
> We can make all parts optional in the new proposed form which would mean 
> you can still write a significant contraction. However, by being verbose 
> you can make the command a complete representation of what is being done 
> without needing to understand the context of the operation (which means 
> code which is more verbose is much more quickly readable).
>
> Anyway, maybe when we finally get to open language we can have a culinary 
> based variant syntax ;)
>
> Warmest Regards,
>
> Mark.
>
> Sent from my iPhone
>
>> On 5 Aug 2018, at 11:23, David Glasgow via use-livecode 
>> <use-livecode at lists.runrev.com> wrote:
>>
>> Maybe 'strain' could be a culinary synonym?
>> ;-)
>>
>> Best wishes
>>
>> David Glasgow
>>
>> Sent from my  iPad via iBrain & iFingers
>>
>> LinkedIn
>>
>>> On 5 Aug 2018, at 16:36, J. Landman Gay via use-livecode 
>>> <use-livecode at lists.runrev.com> wrote:
>>>
>>> This is getting pretty contorted and is becoming less like natural 
>>> language. For what it's worth, I have never been confused by the current 
>>> use of filter. I think of it as pouring soup through a wire strainer. 
>>> Filtering "with" keeps the solids. Filtering "without" dumps them and keeps 
>>> the liquid.
>>>
>>> Maybe I cook too much. In any case, the solids (what remains after 
>>> filtering) are the things you're either keeping or discarding.
>>> --
>>> Jacqueline Landman Gay | jacque at hyperactivesw.com
>>> HyperActive Software | http://www.hyperactivesw.com
>>>> On August 5, 2018 9:38:45 AM Brian Milby via use-livecode 
>>>> <use-livecode at lists.runrev.com> wrote:
>>>>
>>>> Probably better:
>>>>
>>>>
>>>> filter [{lines | items | keys | elements} of] filterSource {keeping | 
>>>> discarding | with | without | [not] matching} {[{wildcard | regex} pattern] 
>>>> filterPattern | where filterExpression} [into targetContainer]
>>>>
>>>>
>>>> So Monte’s example would be:
>>>> filter keys of tFoo keeping where tFoo[each] is not tBar[each]
>>>> (And to get Richard’s result you would need to follow this by an intersect 
>>>> each way. The filter would replace the repeat loop in Mark’s solution)
>>>>
>>>>
>>>> Even though “with where” would be syntactically correct, the preferred 
>>>> usage would be “keeping where”.
>>>>
>>>> Thanks,
>>>> Brian
>>>>> On Aug 5, 2018, 7:32 AM -0500, Mark Waddingham via use-livecode 
>>>>> <use-livecode at lists.runrev.com>, wrote:
>>>>>> On 2018-08-05 07:31, Monte Goulding via use-livecode wrote:
>>>>>> Given I have been wanting to do ^ for a couple of years I decided to
>>>>>> just go ahead and do it… might be a while before we have time to
>>>>>> bikeshed the syntax though.
>>>>>>
>>>>>> https://github.com/livecode/livecode/pull/6626
>>>>>> <https://github.com/livecode/livecode/pull/6626>
>>>>>>
>>>>>> Examples:
>>>>>> local tFoo,tBar
>>>>>> put "foo" into tFoo[1]
>>>>>> put "bar" into tFoo[2]
>>>>>> put "baz" into tBar[1]
>>>>>> put "bar" into tBar[2]
>>>>>> filter keys of tFoo with expression tFoo[each] is tBar[each]
>>>>>> — tFoo now has one key 2 which is `bar`
>>>>>>
>>>>>> put “yes,foo” & return & “no,bar” into tFoo
>>>>>> filter lines of tFoo with expression item 1 of each is “yes”
>>>>>>
>>>>>> We could feasibly not use `with|without` for this forcing the
>>>>>> expression to return true to filter. If we went that way then perhaps
>>>>>> `where` would be nicest?
>>>>>>
>>>>>> filter lines of tFoo where item 1 of each is “yes”
>>>>>
>>>>> Geez @Monte - you do like creating work for me don't you! ;)
>>>>>
>>>>> In terms of syntax - definitely not 'with expression' - that's ghastly.
>>>>> It is a 'where' clause - in the same vein as SQL and other query
>>>>> languages - so no bike-shedding required there (also, pleasingly, all
>>>>> other 'filter' types become sugar for a where clause using operators
>>>>> which the language does not have yet - but obviously we have the code
>>>>> for...).
>>>>>
>>>>> If we are going to bike-shed over syntax - can we do so over the use of
>>>>> 'filter' itself. I don't know why but I have a complete mental block
>>>>> about it - regardless of how many times I use it or read it - I always
>>>>> have to 'double-think' to work out what form to use - is that just me?
>>>>>
>>>>> filter <things> of X with Y
>>>>> filter <things> of X without Y
>>>>>
>>>>> I couldn't tell you just by looking *what* they actually do. I'm not
>>>>> sure why but I think the verb is actually wrong - in all cases you have
>>>>> a set of things and you are either keeping an element, or removing an
>>>>> element... So I wonder if:
>>>>>
>>>>> keep <things> of X where Y
>>>>> discard <things> of X where Y
>>>>>
>>>>> (I'm not particularly attached to keep/discard - but it does need to be
>>>>> a pair of 'true' antonyms which don't intersect with any other 'core'
>>>>> pairs of such things we have).
>>>>>
>>>>> Might be more appropriate?
>>>>>
>>>>> Of course, maybe it is just 'with' / 'without' are inappropriate, and
>>>>> 'where' might actually help me retrain my mind to see with/without as
>>>>> the sugar they truly are.
>>>>>
>>>>> Anyway, thought it worth throwing out there to see what people think?
>>>>>
>>>>> Warmest Regards,
>>>>>
>>>>> Mark.
>>>>>
>>>>> --
>>>>> Mark Waddingham ~ mark at livecode.com ~ http://www.livecode.com/
>>>>> LiveCode: Everyone can create apps
>>>>>
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