Ok the log() helped to narrow things down:
res[v_n]={'mi':v,'ma':v,'c':1,'t':v};
in this context v isn't returned as a Number but as a {}
In number context, like in a Math.min(v,othernumber); it works fine.
Same thing happens with log:
log(v) returns {}
log(''+v) returns -0.453
Any reason why this would be the case since this is not the behaviour of
a Number in normal js (JavaScript-C 1.7.0 2007-10-03) ?
I worked around it by forcing v to become a string here
res[v_n]={'mi':''+v,'ma':''+v,'c':1,'t':''+v};
But when i later do a sum like res[v_n].t += v;
it just concats the v to it instead of adding its values
So there i have to convert it back to a Number() before adding.
On 21/05/10 10:01, Tom Sante wrote:
Yeah I'll try that, see if it gives me any clues.
Is there a way to run your code manually for debugging via the command
line with the JS engine the way couch calls it to build the view? (like
an interactive mode of couchjs)
On 21/05/10 04:59, Zachary Zolton wrote:
Reduce functions can be tricky. My best advice: try log()'ing all your
input and intermediary results; the answer usually jumps out to ya.
On Thursday, May 20, 2010, Tom Sante<[email protected]> wrote:
On 20/05/10 23:52, David Goodlad wrote:
On Thu, May 20, 2010 at 9:38 PM, Tom Sante<[email protected]> wrote:
Hi,
I have a reduce function like this:
[snip]
So for some reason if there is only 1 element to be reduced, on the
line of
res[v_n]={'mi':v,'ma':v,'c':1,'t':v};
v becomes v={} and not the actual number. Any ideas why?
I tested the reduce function with the command line 'js' and send it the
above test keys manually as function argument and then it does result
in the
correct return:
"01:00:000074" -> {raw: {mi: -0.213, ma: -0.213, c: 1, t: -0.213}}
"01:00:000084" -> {raw: {mi: -0.213, ma: -0.213, c: 1, t: -0.213}}
Sounds like you need to specify group_level; Try playing around in
Futon, you'll see a group_level dropdown.
Dave
Why would I need a group_level parameter?
My key is a simple string "01:00:000074".
Its my values don't get correctly generated by couchjs, since it does
out but proper values in normal commandline js.
var v = new Number(values[val][v_n]);
if(res.hasOwnProperty(v_n)){
res[v_n].mi = Math.min(v,res[v_n].mi);
res[v_n].ma = Math.max(v,res[v_n].ma);
res[v_n].c++;
res[v_n].t += v;
}else{
res[v_n]={'mi':v,'ma':v,'c':1,'t':v};
}
It seems that in the above part in the 'else' case the v isn't a
number but an empty object {}
