src/list_reverse.workflows.yaml

# Copyright 2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# [START workflows_list_reverse]
# Reverse the order of elements in a list
# Expected output: `[3,2,1]`
main:
  steps:
    - call_reverse_list:
        call: reverse_list
        args:
          source: [1, 2, 3]
        result: output
    - return_message:
        return: ${output}

reverse_list:
  params: [source]
  steps:
    - init:
        assign:
          - dst: []
    - reverse:
        for:
          value: entry
          in: ${source}
          steps:
            - prepend_value:
                assign:
                  - dst: ${list.prepend(dst, entry)}
    - return_destination:
        return: ${dst}
# [END workflows_list_reverse]