expressions.yml

# https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/evaluate-expressions-in-workflows-and-actions
name: expressions
on: push

jobs:
  expressions:
    runs-on: ubuntu-latest
    steps:
      - name: Literals
        run: |
          echo $myNull
          echo $myBoolean
          echo $myIntegerNumber
          echo $myFloatNumber
          echo $myHexNumber
          echo $myExponentialNumber
          echo $myString
          echo $myStringInBraces
        env:
          myNull: ${{ null }}
          myBoolean: ${{ false }}
          myIntegerNumber: ${{ 711 }}
          myFloatNumber: ${{ -9.2 }}
          myHexNumber: ${{ 0xff }}
          myExponentialNumber: ${{ -2.99e-2 }}
          myString: Mona the Octocat
          myStringInBraces: ${{ 'It''s open source!' }}

      - name: Operators
        run: echo $MY_ENV_VAR
        env:
          MY_ENV_VAR: ${{ github.ref == 'refs/heads/master' && 'value_for_main_branch' || 'value_for_other_branches' }}

      - name: Functions
        run: |
          echo $contains
          echo $startsWith
          echo $endsWith
          echo $format
          echo $formatEscapingBraces
          echo $join
          echo $toJSON
          echo $fromJSON
          echo $hashFiles
        env:
          contains: ${{ contains('Hello world', 'llo') }} # true
          startsWith: ${{ startsWith('Hello world', 'He') }} # true
          endsWith: ${{ endsWith('Hello world', 'ld') }} # true
          format: ${{ format('Hello {0} {1} {2}', 'Mona', 'the', 'Octocat') }} # 'Hello Mona the Octocat'
          formatEscapingBraces: ${{ format('{{Hello {0} {1} {2}!}}', 'Mona', 'the', 'Octocat') }} # '{Hello Mona the Octocat!}'
          join: ${{ join(github.event.issue.labels.*.name, ', ') }} # 'bug, help wanted'
          toJSON: ${{ toJSON(job) }} # { "status": "success" }
          fromJSON: ${{ contains(fromJSON('["push", "pull_request"]'), github.event_name) }} # true
          hashFiles: ${{ hashFiles('**/package-lock.json') }}

      - name: success
        if: success()
        run: echo success

      - name: always
        if: always()
        run: echo always

      - name: cancelled
        if: cancelled()
        run: echo cancelled

      - name: failure
        if: failure()
        run: echo failure