Problem : Given the library method getUser (DB / Local storage fetch asynchronously), fetch all the user objects by ID  in the provided array and return an array consisting of all the requested user objects . It should return the response user object in same order like we are passing the IDs in array

Using promise approach to solve the problem

Example :

Input : [8,99,1,7,42]

Output :[{“id”:8,”name”:”Marut Kala”},{“id”:99,”name”:”Kumara Ganguly”},{“id”:1,”name”:”Shaamil Eid”},{“id”:7,”name”:”Awf Taheri”},{“id”:42,”name”:”Chandra Saini”}]

Here is the nodejs working code

Note :

  1. getUser returns a promise  &  it can be a DB search function for user object based on ID  .We used local array to store user objects
  2. For async purpose we used setTimeout to delay the execution.
  3. We dont need to think about return order , promise.each always return result based on input array order 
Promise | Bluebird | Promise chain | Loop | nested Promise – NodeJS implementation
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2 thoughts on “Promise | Bluebird | Promise chain | Loop | nested Promise – NodeJS implementation

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