valueDiff for arrays?

[Mark Waddingham]

I think you are right - I will double check.

There is actually an internal function (in C) - two in fact - IsSequence and IsNumericSequence which we should plumb into 'is a' to make this clearer.

They basically use the extents internal impl (well an optimized form in one case).

Warmest Regards,

Mark.

Sent from my iPhone

> On 8 Aug 2018, at 00:11, Dick Kriesel via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> 
>>> On Aug 7, 2018, at 9:29 PM, Jerry Jensen via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> 
>>> On Aug 7, 2018, at 8:35 PM, Mark Wieder via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> 
>>> On 08/07/2018 07:57 PM, Dick Kriesel via use-livecode wrote:
>>>>> On Aug 7, 2018, at 5:47 PM, Alex Tweedly via use-livecode <use-livecode at lists.runrev.com> wrote:
>>>>> 
>>>>> Is there an easy way to test whether an array is (currently) a sequence array ?
>>>>> 
>>>>> something easier than
>>>>> put the extents of tArray into tmp
>>>>> if item 1 of tmp = 1 AND item 2 of tmp = the number of elements in tArray then
>>>> slightly easier, at least:
>>>> function isSequence p
>>>> return the extents of p is 1, number of elements in p
>>>> end isSequence
>>> 
>>> If I'm understanding things right there's more to it:
>>> The keys all have to be integers and (I think) only those integers from 1 to (the number of keys).
>> 
>> That was my understanding as well.
>> .Jerry
> 
> "the extents" implements those rules, so "isSequence" doesn’t need to.
> 
> Or is there evidence "isSequence" fails?
> 
> — Dick
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