for … in … return
FEEL language construct
for name in list return expression
FEEL's iteration construct, the equivalent of a map or a for loop in other languages. It evaluates the return expression once per element and collects the results into a new list; it never mutates anything. Several iteration contexts separated by commas produce the cartesian product, and a range can be iterated directly instead of a list.
Syntax elements
| Element | Type | Description |
|---|---|---|
| name | name | the iteration variable, visible inside the return expression |
| list | list or range | what to iterate; a..b iterates the integers of a range |
| return | any | evaluated per element; results are collected into a list |
Examples
for i in [1,2,3] return i * 2
[2, 4, 6]
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for i in 1..4 return i * i
[1, 4, 9, 16]
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for x in [1,2], y in [10,20] return x + y
[11, 21, 12, 22]
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for c in ["a","b"] return upper case(c)
[A, B]
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Related constructs
list filter […] · some … satisfies · every … satisfies
Related functions
Defined by the OMG DMN 1.6 specification, chapter 10.3 (the FEEL grammar and semantics).