docker = "docker run " private formatEnvironmentVars(ArrayList envVars) { envVars.collect { "-e \"$it\"" }.join(" ") } myMap = [test: ["NOMAD_DEPLOY_urlprefix=urlprefix-s.cloud.integration.qa-mp.so/static", "NOMAD_DEPLOY_hostclassifier=nomad_worker", ]] print docker + formatEnvironmentVars(myMap.get('test',[]))