How is whenCompleted different from then in Future

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Question - How is whenCompleted() different from then() in Future?

Answer -

.whenComplete will fire a function either when the Future completes with an error or not, while .then returns a new Future which is completed with the result of the call to onValue (if this future completes with a value) or to onError (if this future completes with an error)
.whenCompleted is the asynchronous equivalent of a "finally" block.

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Dart Programming Interview Questions and Answers