javascript - Foreach callback when finish

Because forEach accept only one callback. Since you are calling asynchronous method inside forEach you need to check whether all asyn call completed

var response = [];

myArray.forEach(function(data, index) {
    data.asyncFunction(function(result) {
         response.push(result);
         if(response.length  === myArray.length) {
                 //foreach work done
         }
    });
});