Ok, Digging deeper into xchange.js , it looks like I'm transforming the
response but re-using the same object which is causing the error.
Thanks for the help!! This actually taught me a bit :)
On Monday, 26 January 2015 11:03:49 UTC-5, Adrien Risser wrote:
>
> Hi,
>
> My only guess without looking at your code would be that the "body" passed
> to your ticker callback is overwritten / pointing to the same object.
>
> // Pseudo code:
>
> /* inside xchange module */
>
> var obj = {};
>
> /* main.js */
>
> callback(err, obj);
>
> /* inside async.map */
>
> results.push(obj);
>
> /* "end" callback */
>
> console.log(results);
>
> // [obj, obj, obj]
>
> Try this:
>
> console.log(results[0] === results[1]);
>
> If true, then something like above might be happening.
> If not, then new objects are created but values are the same (your method
> routing may be faulty).
>
> Cheers,
>
> On Mon, Jan 26, 2015 at 4:22 PM, Justin Maat <[email protected]
> <javascript:>> wrote:
>
>> Sorry for the title, but I can't think of an easier way to word this.
>>
>> I'm trying to use the async library <https://github.com/caolan/async#map>
>> with
>> Node.js to run 3 asynchronous functions and do some operation on the
>> results of all 3. From what I understand, the map() function allows me to
>> run all 3 and apply an argument to an iterator, then provide a callback to
>> operate on the results of all 3 async functions (stored in an array).
>>
>> The results are showing 3 successful responses, but they all contain the
>> data from that last (3rd) function run, the other 2 are overwritten for
>> some reason.
>>
>> For example,
>>
>> /**map the array of exchange names through the iterator function
>> * xchange is an external library which has functions of the form -
>> * xchange.bitstamp.ticker(callback),
>> xchange.bitfinex.ticker(callback), etc..
>> */
>> var xchange = require("xchange.js"),
>> async = require("async");
>>
>> async.map([ "bitfinex", "bitstamp", "okcoin" ],
>> function(item, callback) {
>> xchange[item].ticker(function(err, body) {
>> console.log("item: " + item);
>> console.log(body);
>>
>> return callback(err, body);
>> });
>> }, function(err, results) {
>> console.log(results);
>> });
>>
>>
>> //print out
>> item: bitstamp
>> { bid: 275.16,
>> ask: 275.21,
>> low: 245,
>> high: 309.9,
>> volume: 54017.1092978,
>> timestamp: 1422283998 }
>> item: okcoin
>> { bid: 279.25,
>> ask: 280.44,
>> low: 242.93,
>> high: 310.57,
>> volume: 29342.543,
>> timestamp: 1422284015 }
>> item: bitfinex
>> { bid: 279.2,
>> ask: 279.77,
>> low: 246.59,
>> high: 315,
>> volume: 165380.17021898,
>> timestamp: 1422284011.1361156 }
>>
>> //Why are these all from the last run? Should be the results of all
>> 3 above
>> [ { bid: 279.2,
>> ask: 279.77,
>> low: 246.59,
>> high: 315,
>> volume: 165380.17021898,
>> timestamp: 1422284011.1361156 },
>> { bid: 279.2,
>> ask: 279.77,
>> low: 246.59,
>> high: 315,
>> volume: 165380.17021898,
>> timestamp: 1422284011.1361156 },
>> { bid: 279.2,
>> ask: 279.77,
>> low: 246.59,
>> high: 315,
>> volume: 165380.17021898,
>> timestamp: 1422284011.1361156 } ]
>>
>>
>> Basically the xchange ticker function uses the [request][2] module to
>> call an http request on each ticker api. The results (somewhat
>> transformed) are returned.
>>
>> I'm able to run the following code
>> <https://gist.github.com/jxm262/c32cf5ede3c1d5e4bfd6> with no errors, so
>> I'm certain it has something to do with my xchange library code.
>>
>> Any tips or ideas on what could cause this?
>>
>>
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>
>
>
> --
> Adrien Risser,
> Freelance Node.js Consultant
> M. +33 6 59 60 32 58
>
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