jquery - Select all field values of an observable array in a comma separated string -

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i've got observablearray this:

self.displaymessagecollection = ko.observablearray();

i'm getting collection , pushing items displaymessagecollection this: 

self.displaymessagecollection.push({                                                     messageid: msgid,                         loader: 'block',                         uploadopacity: 'uploadopacity',                         sentstatus: 'wait',                         chattype: self.tochattype()                     });

i need messageid field values comma seperated string array.

i know can loop items , messageid values. want know if can query on observablearray, i.e. somehow single query field values comma seperated string?

you can use built in map function on underlying array , , can use join function comma separated string: 

self.displaymessagecollection().map(function(i) { return i.messageid }).join(",")

if need logic multiple times can create helper function observable array.


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