Step 7 - Use a Map to store parameters

Step 7 - Use a `Map` to store parameters

Let us use a simple Map to add 2 configuration parameters:

// Step - 7
process addTupleWithMap {
  input:
    tuple val(id), val(input), val(config)
  output:
    tuple val("${id}"), val(output)
  exec:
    output = (config.operator == "+")
                ? input + config.term
                : input - config.term
}
workflow step7 {
  Channel.from( [ 1, 2, 3 ] ) \
    | map{ el ->
      [
        el.toString(),
        el,
        [ "operator" : "-", "term" : 10 ]
      ] } \
    | addTupleWithMap \
    | view{ it }
}

The result is:

> nextflow -q run . -entry step7
WARN: DSL 2 IS AN EXPERIMENTAL FEATURE UNDER DEVELOPMENT -- SYNTAX MAY CHANGE IN FUTURE RELEASE
[2, -8]
[3, -7]
[1, -9]