Sending an Object Back from a Function

Currently, my goal is to extract an object from a function. By utilizing an Angular JS promise, I am able to successfully log the availableProviders once they have finished loading, and this information is being displayed correctly in my console.

function getServiceProviders(serviceId) {
  var serviceProviders = ref.child('services').child(serviceId).child('providers');
  var providers = ref.child('providers');

  serviceProviders.on('value', function(snapshot) {        // on services.serviceId.providers
    var availableProviders = {};                           // create empty availableProviders array

    snapshot.forEach(function(childSnapshot) {             // for each provider in services.serviceId.providers
      var key = childSnapshot.key();                       // grab each provider's key
      providers.on('value', function(snap) {               // on providers
        if (snap.hasChild(key)) {                          // if providers has a child that matches the var key above
          var item = snap.child(key);                      // store that child in a var called item
          availableProviders[item.key()] = item.val();     // add item to availableProviders array
        }
      });
    });                                                    // rinse and repeat

    var defer = $q.defer();
    defer.promise
      .then(function() {
        console.log(availableProviders);
      })

    defer.resolve();
  });

  return availableProviders;
}

The issue arises when I attempt to have the getServiceProviders() function provide these availableProviders, resulting in an error indicating that`availableProviders` is not defined outside of the function scope.

ReferenceError: availableProviders is not defined

I am seeking advice or guidance on how to work around this obstacle. Any assistance would be greatly appreciated. Thank you in advance!

Answer №1

Issue with Closures in JavaScript - I suggest moving the var availableProviders = {}; declaration outside the

serviceProviders.on('value', function(snapshot) {
function to resolve the problem.

Updated Code Snippet:

function getServiceProviders(serviceId) {
    var serviceProviders = ref.child('services').child(serviceId).child('providers');
    var providers = ref.child('providers');
    var availableProviders = {}; // moved it outside for global scope
    serviceProviders.on('value', function(snapshot) { // on services.serviceId.providers

        snapshot.forEach(function(childSnapshot) { // iterating through each provider in services.serviceId.providers
            var key = childSnapshot.key(); // retrieving each provider's key
            providers.on('value', function(snap) { // on providers
                if (snap.hasChild(key)) { // checking if providers has a matching child key
                    var item = snap.child(key); // storing the child in 'item' variable
                    availableProviders[item.key()] = item.val(); // adding item to availableProviders object
                }
            });
        }); 

        var defer = $q.defer();
        defer.promise
            .then(function() {
                console.log(availableProviders);
            })

        defer.resolve();
    });

    return availableProviders;
}

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