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thenApply (Future method)
Last update:
Jun 9, 2026
After this Future succeeds, runs your function on the thread that completes the Future and returns a new Future with the transformed value.
Description
thenApply is the synchronous counterpart to thenApplyAsync. The callback runs on the completing thread, not on the async executor. Use it for fast, non-blocking work that should stay on the same thread.
Returns
A new Future.
Category
Asynchronous programming
Function syntax
future.thenApply(function)Parameters
| Parameter | Description |
|---|---|
| function | Required. A function that takes the previous result and returns the next value. |
See also
Example
Mix sync and async stages in one chain (from product tests).
future = runAsync(function() { return 5; })
.thenApply(function(x) { return x * 2; })
.thenApplyAsync(function(x) { return x + 5; })
.thenApply(function(x) { return x * 2; })
.thenApplyAsync(function(x) { return x + 10; });
writeOutput(future.get()); // 40
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