Pass array as inputs to Azure DevOps YAML task - azure-devops

Question

I'm trying to configure a CI that will produce NuGet packages as artifacts on Azure DevOps (that will be later pushed to my NuGet server).
For this, I'm using Builds Pipelines on Azure DevOps, the YAML version.
I have 3 projects that should build packages. I'm using NuGetCommand#2 to accomplish this task :
- task: NuGetCommand#2
inputs:
command: pack
packagesToPack: $(Build.SourcesDirectory)/src/HTS_MessageEngine.Communication/HTS_MessageEngine.Communication.csproj
majorVersion: $(majorVersion)
minorVersion: $(minorVersion)
patchVersion: $(patchVersion)
versioningScheme: byPrereleaseNumber
However, I have to duplicate this block 3 times, for each project. Is there a way to specify an array of projects in the packagesToPack parameter? So far, the version is the same for each package, so I don't need three different blocks...
Note: these 3 projects are all 3 NetStandard and properties for package building are stored in csproj directly

Answer 1

you can use each function (if its available at all at this point in time):
# my-template.yml
parameters:
steps:
- ${{ each project in parameters.projects }}:
- task: PublishBuildArtifacts#1
displayName: Publish ${{ project }}
inputs:
PathtoPublish: '$(Build.ArtifactStagingDirectory)/${{ project }}.zip'
# ci.yml
steps:
- template: my-template.yml
parameters:
projects:
- test1
- test2
Github PR for this functionality: https://github.com/Microsoft/azure-pipelines-yaml/pull/2#issuecomment-452748467

Answer 2

For above code I got this exception running a build:
my-template.yml (Line: 1, Col: 12): Unexpected value ''
but this works for me:
# my-template.yml
parameters:
- name: projects
type: object
default: {}
steps:
- ${{ each project in parameters.projects }}:
- task: PublishBuildArtifacts#1
displayName: 'Publish ${{ project }}
inputs:
PathtoPublish: '$(Build.ArtifactStagingDirectory)/${{ project }}.zip'
and then:
# ci.yml
steps:
- template: my-template.yml
parameters:
projects:
- test1
- test2