a way to know when all callbacks are done in javascript

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I have many calls to a service at the end of which i want to write to a file my final collection when all the callbacks of the service have returned.
is there there a way to be sure that all callbacks are done ?

for (id in idsCollection) {
    object.callService(id, function (res) {
        collection.push(res);
    });
}

filewriter.writetoFile("filename.json", JSon.Stringify(collection));

EDIT : just for the record i’m using cheerio with nodeJS.

102 thoughts on “a way to know when all callbacks are done in javascript”

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