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Newsgroups: comp.lang.javascript
Date: Fri, 27 Apr 2018 07:13:47 -0700 (PDT)
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Subject: Re: Playup Event list hangs
From: =?UTF-8?Q?Jonas_Th=C3=B6rnvall?= <jonas.thornvall@gmail.com>
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Xref: csiph.com comp.lang.javascript:34930

Den torsdag 26 april 2018 kl. 12:23:44 UTC+2 skrev Jonas Th=C3=B6rnvall:
> Den torsdag 26 april 2018 kl. 11:03:28 UTC+2 skrev Evertjan.:
> > =3D?UTF-8?Q?Jonas_Th=3DC3=3DB6rnvall?=3D <jonas.thornvall@gmail.com> wr=
ote on 26
> > Apr 2018 in comp.lang.javascript:=20
> >=20
> > > I have a list of timings where each time refer to playup of a midinot=
es.
> > > See noteOnMessage below.
> > >=20
> > > waitEv is a list of "wait times" between events, it is already
> > > precalculated i checked it is correct. I keep waitlists "timings" in
> > > sync with the events by simply step forward y++.=20
> > >=20
> > > I probably do not understand how the recursive call i tried to implem=
ent
> > > work, because it hangs after second event/note is played?=20
> >=20
> > Methinks you do not understand proper debugging,
> > as viewing the value of y in each recursion would have given it away.
> > =20
> > > function doPlayup(y) {
> > >     if (waitEv.length) {
> > >         var waittime =3D waitEv.shift();
> > >         console.log("Waiting: " + waittime);
> > >         noteOnMessage =3D [track[tracknr].midiMess[y].data0,
> > >         track[tracknr].midiMess[y].data1,
> > >         track[tracknr].midiMess[y].data2]; output.send(noteOnMessage)=
;=20
> > >         document.getElementById("keystream").value=3DwaitEv[y];
> > >         y++;=20
> > >         setTimeout(doPlayup, waittime);
> > >     }=20
> > >}
> >=20
> > Your function is not recursive in the sense of scope,
> > as the setTimeout() does not conduct the nonglobal y value.
> >=20
> > perhaps it would 'work' like this:
> >=20
> > let y=3D17;
> > doPlayup();
> >=20
> > function doPlayup() {
> > .....
> > };
> >=20
> > but then, global variables are prone to misconceptions.
> >=20
> > --=20
> > Evertjan.
> > The Netherlands.
> > (Please change the x'es to dots in my emailaddress)
>=20
> Thanks for the advice, Evertjan
>=20
> I am not used to these types of self referencing functions.
> And i try to figure out howto get ***the last note*** played?
> But it does not behave the way i expect.
>=20
>  pyp=3D-1;
>  doPlayup();
>  noteOnMessage =3D [track[tracknr].midiMess[pyp].data0,        track[trac=
knr].midiMess[pyp].data1, track[tracknr].midiMess[pyp].data2];=20
>  output.send(noteOnMessage);
>=20
> function doPlayup() {
>     if (waitEv.length) {
>         var waittime =3D waitEv.shift();
>         console.log("Waiting: " + waittime);
>         if (pyp>-1)=20
>         {
>         noteOnMessage =3D [track[tracknr].midiMess[pyp].data0, track[trac=
knr].midiMess[pyp].data1, track[tracknr].midiMess[pyp].data2];=20
>         output.send(noteOnMessage);=20
>         }
>         pyp++;=20
>         setTimeout(doPlayup, waittime);=20
>     }=20
> }

Well of course i could use the ugly method adding a last note patch message=
, put a tail on it. Maybe shift just is not a good use in this case? What k=
ind of loop is preferable for this type of problem?=20
And i am a bit curious how good programmers use shift in cases like this?