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Discussion on: Explain Thunks in JavaScript Like I'm Five

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John Wright

From Wikipedia:

In computer programming, a thunk is a subroutine used to inject an additional calculation into another subroutine. Thunks are primarily used to delay a calculation until its result is needed, or to insert operations at the beginning or end of the other subroutine. They have many other applications in compiler code generation and modular programming.

The term originated as a humorous, incorrect, past participle of "think". That is, a "thunk value" becomes available after its calculation routine is thought through, or executed.