Iterate through array of JSON objects in coffeescript

Question

Hi I have the following looking dataset:

[
    { date:"somedatehere", series1:"series1Value", series2:"series2Value" ..., seriesX:"seriesXValue"}, 
    { date:"anotherDateHere", series1:"anotherseries1Value", series2:"anotherseries2Value"...,seriesX:"anotherseriesXValue"},...
]

I'd like to loop through this in coffeescript and extract arrays such that I would have an array of dates (comprised of somedatehere, anotherDateHere, etc), series1 values, series2 values, seriesX values, etc.

Preferrably all of these arrays would go in order such that dates[0] === somedatehere and series1[0] === series1Value and series2[0] === series2Value and seriesX[1] === anotherseriesXValue etc.

Is there an easy way to go about doing this in coffeescript?

Artem Volkhin · Accepted Answer · 2014-06-29 13:25:12Z

1

dates = (obj.date for obj in my_array)
series1 = (obj.series for obj in my_array)

in case you have a lot of series and don't want to manually enumerate them:

types = (k for k, v of my_array[0])
result = {}
result[type] =  (obj[type] for obj in my_array) for type in types

Will give you

my_array = [{date: 1, x: 2}, {date: 123, x: 2134}]

result = {
  date: [ 1, 123 ],
  x: [ 2, 2134 ]
}

edited Jun 29, 2014 at 13:25

answered Jun 29, 2014 at 13:12

Artem Volkhin

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