javascript - accessing objects property dynamically (appending a string) -

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i have loop in underscore

_.each(questions,function(data){  a="reason"+data.choosen; %>  <%= data.a; %>  <% count++; });  %>

the data.choosen gets either 1 or 2 or 3 or 4. based on want display data.reason1 or data.reason2 or data.reason3 or data.reason4 property of data object.

i tried above approach doesn't work.

in javascript

x.y

is equivalent to

x["y"]

so can change code to

data[a]

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