Angular providers utilize setter functions for data manipulation

Factories in Angular are considered an abstraction of providers, simplifying the process of returning data with less code. However, providers offer more flexibility as they allow for better definition of a service's functionality. I've been struggling to understand how to properly call a simple function from a provider. It seems like everyone does it differently and I can't seem to get mine to work:

myApp.provider('myProvider', function() {
    myVar = true;

    $get: function() {
        return {
            myVar: myVar,
        }
    },

    toggleFalse = function() {
        myVar = false;
    },
})

myApp.controller('myController', function($scope, myProvider) {
    myProvider.toggleFalse();
});

Unfortunately, this approach doesn't seem to be working - and services are still a bit confusing to me. The error message says toggleFalse is not defined. How can I properly define a setter function on an Angular service that can be controlled through a controller?

Answer №1

When you utilize console.dir(myProvider), it will reveal that the object returned from $get. To properly implement the function, ensure to place it on the returned object:

$get: function() {
    return {
        myVar: myVar,
        toggleFalse: function() {
            myVar = false;
        },           
    }
},

Answer №2

This question revolves around the concept of closure.

If you desire each instance to possess completely unique attributes, then house everything within $get.

However, if you prefer most of the object to be distinct while sharing certain methods or objects/arrays among instances, then define those outside of $get within the function closure and include them in the returned object from $get.

... ("myProvider", function () {
  var sharedValue = 19,
      sharedFunction = function () {
          sharedValue += 1;
          return shared value;
      };


  return {
      $get : function () {
          return {
              unique : 1,
              shared : sharedFunction
          };
      }
  };

This issue stems from fundamental JavaScript behavior, encapsulated within an Angular context.

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