Why are Callbacks in Promise .then Methods an Anti-Pattern in AngularJS?

Why Callbacks from Promise .then Methods are an Anti-Pattern

Question:

Is it an anti-pattern to provide callback functions to AngularJS services within promise .then methods? If so, how should the code be refactored and why?

Answer:

Re-factor the Code:

Change the getTokens method in the tokenService to return the promise directly instead of accepting a callback:

In the controller, use the .then method to chain success/fail handlers:

Why the Original Way was an Anti-Pattern:

• Prevents further chaining of promise handlers. The original code prevents chaining additional .then methods for further processing of the response.
• Inverts control. By accepting a callback, the control of processing the response is moved from the caller module to the called module, which is not ideal.
• Unnecessary use of promises. While the $http service returns promises, the original code converts them back to callbacks, making the use of promises redundant.
• Potential for confusion. Using promises as callbacks introduces an unnecessary concept into the codebase and can be difficult for team members to understand.

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