Use CircleCI's Matrix Parameter to Reduce Duplication

In CircleCI, the matrix parameter enables you to run the same jobs with different combinations of inputs. This helps reduce redundancy in your config.yml.

For example, lets say you want to run a build job on three different executors: Windows, MacOS and Alpine Linux. Your config.yml can look like the following:

jobs:
  - build:
      name: test-build-on-alpine
      executor: "alpine"
  - build:
      name: test-build-on-macos
      executor: "macos"
  - build:
      name: test-build-on-windows
      executor: "windows"

Notice how the build job is repeated three times in our config (once per executor). The matrix parameter enables you to reference the build command once in your config.yml.

jobs:
  - build:
      name: test-build-on-<<matrix.executor>>
      matrix:
        parameters:
        executor: ["macos", "alpine", "windows"]

For more details, you can refer to the official CircleCI documentation on using matrix jobs.