I have a list of object and I want to get a list from its field.
Say I pass List<Auto> autos from java side to the template on the document side. Each Auto has a field of speed.
So the result should be list of speed.
I can do it manually looping through the autos and building a new list from the speed fields.
Is there any easier solution built in for this in the freemarker something like 'autos.speed?tolist'
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1 Answer
You are looking for the sequence built-in map, which is available from version 2.3.29. It returns a new sequence where all elements are replaced with the result of the parameter lambda, function, or method. This allows you to do:
autos?map(auto -> auto.speed)
If you want to do this in Java, see:
There it comes down to:
autos.stream().map(Auto::getSpeed).collect(Collectors.toList());
