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thenApply
Last update:
May 18, 2026
After this Future completes normally, runs a function on the completing thread that maps the result to a new value.
Description
thenApply is an instance method on a CFML Future (for example a value returned from runAsync). When the previous stage completes successfully, your function runs on the completing thread and returns the next value. The method returns a new Future that completes with that mapped value.
This is the synchronous counterpart to thenApplyAsync, which runs the mapper on the async executor. Use thenApply for short, CPU-light mapping that should not incur an extra async hand-off.
Returns
A new Future.
Category
Asynchronous programming
Function syntax
future.thenApply(function)Parameters
| Parameter | Description |
|---|---|
| function | Required. A function that accepts this stage’s result and returns the mapped value. |
Example
Map a numeric result on the completing thread.
<cfscript>
future = runAsync(function() { return 5; });
mapped = future.thenApply(function(x) { return x * 2; });
writeOutput(mapped.get()); // 10
</cfscript>
See also
thenCompose
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