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

guest271314 guest271314 at gmail.com
Thu Mar 7 22:05:34 UTC 2019


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(a[0]) == 0 || Math.abs(a[0]) == -0)
>>>>      && a.length == 1)
>>>>
>>>>
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