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

Steve Fink sphink at gmail.com
Thu Mar 7 22:46:05 UTC 2019

```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
> <mailto: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
>     <mailto: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 <mailto: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 <mailto: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
>                 <https://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 <mailto: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
>                     <mailto:guest271314 at gmail.com>> wrote:
>
>
>
>                         ---------- Forwarded message ---------
>                         From: *guest271314* <guest271314 at gmail.com
>                         <mailto: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
>                         <mailto: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)
>
>                         |functionnumberToArray(n){if(Math.abs(n)==0||Math.abs(n)==-0){return[n]}constr
>                         =[];let[a,int=Number.isInteger(a),d =g =[],e
>                         =i =0]=[n ||this.valueOf()];if(!int){lete
>                         =~~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);}returnr;}functionarrayToNumber(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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