Proposal: 1) Number (integer or decimal) to Array 2) Array to Number (integer or decimal)

guest271314 guest271314 at gmail.com
Thu Mar 7 22:55:17 UTC 2019


Cannot get into "a large number of users" heads. Again, am not interested
in overcoming conjecture. If the proposal does not meet you folks'
criteria, so be it.

On Thu, Mar 7, 2019 at 10:46 PM Steve Fink <sphink at gmail.com> wrote:

> Any addition to the JavaScript language needs to (1) be motivated by a use
> case encountered by a large number of users, (2) cannot be implemented in a
> straightforward and reliable way by a library, (4) is implementable by a JS
> implementation without undue trouble, and (4) does not conflict with other
> parts of the language.
>
> For your proposal:
>
> (1) - absolute fail
> (2) - arguable
> (3) - uncertain, depends on exact semantics
> (4) - pass
>
> Unless you can somehow prove that a large numbers of users give a rat's
> hindquarters about things that this would enable, this is a nonstarter.
>
> It would be useful to have a FAQ somewhere with a version of the above 4
> rules that is better worked out and justified, so we could point to that.
> (From whatever public-facing forum is selected for the future; this one is
> dead.)
>
> On 3/7/19 2:22 PM, guest271314 wrote:
>
> Have you read the proposal, and the first response to your inquiry? It is
> simpler to have the ability to add, subtract, divide, or otherwise
> manipulate individual nth indexes of an integer or decimal represented as
> an array of integers potentially containing one decimal than trying to
> perform the same mathematical operations on a number in JavaScript
> (essentially broken in JavaScript due to the floating-point number issues).
>
> Will re-post a use case, again
> ~~(128.625*9*1.074)//1243
> ~~(128.625*9*1.144)//1324 where if the requirement is to increment the
> decimal portion of 1.074 or 1.144 if the decimal is first converted to an
> array, we can use array methods to tests the matches we are looking for.
> For example, [1.0, 7, 4]
> representation of 1.074 allows each of the portions of the number to be
> adjusted independently. Since we have previously defined a .toNumber()
> Array method we know we can get the value of the array as a JavaScript
> number.
>
> On Thu, Mar 7, 2019 at 10:12 PM Jeremy Martin <jmar777 at gmail.com> wrote:
>
>> By "real world" we mean somewhere outside of a code challenge or
>> similarly low utility program context.
>>
>> You mentioned statistics, for example. Can you reference a specific
>> example from that domain where these methods would offer an advantage?
>>
>> On Thu, Mar 7, 2019, 5:05 PM guest271314 <guest271314 at gmail.com> wrote:
>>
>>> Not sure what you mean by "real world" use case. Described at least one
>>> use case at the proposal. Statistics; graphs; number and integer
>>> manipulation using indexes of arrays with ability to convert manipulated
>>> array back to number.
>>>
>>> On Thu, Mar 7, 2019 at 9:56 PM Naveen Chawla <naveen.chwl at gmail.com>
>>> wrote:
>>>
>>>> What is the real world use case, presuming it's not just an academic
>>>> exercise
>>>>
>>>> On Thu, 7 Mar 2019, 9:08 pm guest271314, <guest271314 at gmail.com> wrote:
>>>>
>>>>> Ability to adjust *nth* digit of an integer or decimal by adjusting
>>>>> decimal or integer at *nth* index of array, to try to solve OEIS
>>>>> A217626 oeis.org/A217626 directly, for example
>>>>>     ~~(128.625*9*1.074)//1243
>>>>>     ~~(128.625*9*1.144)//1324
>>>>> where the decimal portion can be manipulated by referencing the index
>>>>> of an array, then converting the array back to a number.
>>>>>
>>>>> On Thu, Mar 7, 2019 at 8:55 PM Jeremy Martin <jmar777 at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Can you explain the motivation for this proposal?
>>>>>>
>>>>>> At first blush, this seems like an incredibly arbitrary pair of value
>>>>>> conversion utilities. Are there real world applications for this?
>>>>>>
>>>>>> On Thu, Mar 7, 2019 at 3:43 PM guest271314 <guest271314 at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ---------- Forwarded message ---------
>>>>>>> From: guest271314 <guest271314 at gmail.com>
>>>>>>> Date: Thu, Mar 7, 2019 at 8:35 PM
>>>>>>> Subject: Proposal: 1) Number (integer or decimal) to Array 2) Array
>>>>>>> to Number (integer or decimal)
>>>>>>> To: <es-discuss at mozilla.org>
>>>>>>>
>>>>>>>
>>>>>>> Original concept: Integer or decimal to array and array to decimal
>>>>>>> or integer https://codegolf.meta.stackexchange.com/a/17223
>>>>>>>
>>>>>>> Proof of concept (with bugs)
>>>>>>>
>>>>>>> function numberToArray(n) {
>>>>>>>
>>>>>>>   if (Math.abs(n) == 0 || Math.abs(n) == -0) {
>>>>>>>     return [n]
>>>>>>>   }
>>>>>>>
>>>>>>>   const r = [];
>>>>>>>
>>>>>>>   let [
>>>>>>>     a, int = Number.isInteger(a), d = g = [], e = i = 0
>>>>>>>   ] = [ n || this.valueOf()];
>>>>>>>
>>>>>>>   if (!int) {
>>>>>>>     let e = ~~a;
>>>>>>>     d = a - e;
>>>>>>>     do {
>>>>>>>       if (d < 1) ++i;
>>>>>>>       d *= 10;
>>>>>>>     } while (!Number.isInteger(d));
>>>>>>>   }
>>>>>>>
>>>>>>>   for (; ~~a; r.unshift(~~(a % 10)), a /= 10);
>>>>>>>
>>>>>>>   if (!int) {
>>>>>>>     for (; ~~d; g.unshift(~~(d % 10)), d /= 10);
>>>>>>>     g[0] = g[0] * (1 * (10 ** -i))
>>>>>>>     r.push(...g);
>>>>>>>   }
>>>>>>>
>>>>>>>   return r;
>>>>>>> }
>>>>>>> function arrayToNumber(a) {
>>>>>>>   if ((Math.abs<span class="gmail-m_2662878951066317968m_7497912379499730396gmail-m_-49591865513921258gmail-m_191674293613409874m_-1290191079188355796gmail-pun" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:inherit;
>>>>>>>
>>>>>>>
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