What is a Promise in JavaScript?

Ravi Ranjan Jaiswal
Ravi Ranjan Jaiswal

Posted On: Feb 22, 2018


An object that is able to produce a single value sometime in the future is known as Promise. The single value may either be a resolved value, or it can be a reason that it’s not resolved. There can be three states in which Promise can be:

  • Fulfilled
  • Reject
  • Pending

There can be callbacks that can be attached to handle the fulfilled value or the rejection’s reason, this can be done by the Promise users.

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