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 <jxm...@gmail.com> 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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