swf-runtime 1.0.0-alpha9

document:
  dsl: '1.0.0'
  namespace: test
  name: for-sum-example
  version: '0.1.0'
do:
  - sumAll:
      for:
        each: number
        in: .input
      do:
        - accumulate:
            set:
              counter: ${.counter+$number}
      output:
        as: "${ .counter }"