for strava stream requests, assuming x/y mapping

streamloader.js

var strava = strava || {};
// https://www.strava.com/api/v3/activities/131057926/streams/heartrate?access_token=6d8df9236d33c0e00ad517e720f9cd3c6d58e265
strava.streamLoader = function(streams){
  _.extend(this, Backbone.Events);
  this.streams = streams;
  this.x = streams.x;
  this.y = streams.y;
  this.activity = streams.activity;
  this.accessToken = '6d8df9236d33c0e00ad517e720f9cd3c6d58e265';
  this.url = 'http://www.strava.com/api/v3/activities/'+this.activity+'/streams/'+this.x+','+this.y+'?access_token='+this.accessToken+'&callback=?';
};

strava.streamLoader.prototype = {
  request: function(){
    var me = this;
    jQuery.ajax({
      url: me.url,
      dataType: 'jsonp',
      type: 'GET',
      success: _.bind(me.onSuccess, me),
      error: _.bind(me.onError, me)
    });
  },
  formatData: function(data){
    var me = this, yData, xData;
    data.forEach(function(d){
      if (d.type == me.y){
        yData = d.data;
      }else if (d.type == me.x){
        xData = d.data;
      }
    });

    data = _.map(xData  , function(d,i){
      var h = {};
      h[me.x] = d;
      h[me.y] = yData[i];

      return h;
    });
    return data;
  },
  onSuccess: function(data){
    this.data = this.formatData(data);
    this.trigger('ready', { activity: this.activity, data: this.data });
  },
  onError: function(data){
    this.trigger('error', data)
  }
};