Can you please explain the importance of the enforce parameter within an AngularJS Factory?

As I delved into the intricacies of how angular constructs factories through the module.factory() method, I discovered that internally angular relies on the following method which in turn utilizes a provider.

function factory(name, factoryFn, enforce) 

Therefore, my curiosity is piqued by the third parameter enforce within this function - what exactly is its purpose?

Answer №1

When you're in the process of creating an Angular service or factory, it's interesting to note that Angular ultimately utilizes the same function for both cases:

function factory(name, factoryFn, enforce) {
  return provider(name, {
    $get: enforce !== false ? enforceReturnValue(name, factoryFn) : factoryFn
  });
}

For a service, typically there isn't a return value involved, and behind the scenes, Object.create() is employed to generate an object containing the sayHello method.

app.service('MyService', function () {
  this.sayHello = function () {
    console.log('hello');
  };
});

In contrast, with a factory, an object literal is returned instead:

app.factory('MyService', function () {
  return {
    sayHello: function () {
      console.log('hello');
    };
  }
});

The use of enforce is primarily to ensure a return value. It's not solely about deciding between "service or factory," as even from a service, you can still return an object literal if desired:

app.service('MyService', function () {
  return {
    sayHello: function () {
      console.log('hello');
    };
  }
});

As for the dilemma of "Which one should you choose?" feel free to explore this resource for further insights:

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