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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