Thunk

Definitions

1. A function that wraps an expression to delay its evaluation until the result is actually needed. In Redux, a thunk is an action creator that returns a function (instead of a plain action object) enabling async dispatch of side effects like API calls.

   In plain English: A wrapper function that postpones doing work until someone actually asks for the result.

   Example: "The fetchUser thunk dispatches a loading action, awaits the API call, then dispatches success or failure."

Related Terms

• Lambda Calculus
• Option
• Parser Combinator
• Partial Function
• Redux Saga
• Smart Constructor
• State Reducer
• Tagged Union