Pipes_and_filters.js

// data source
var incoming_messages = [
  "message 1",
  "message 2",
  "message 3",
];

// filter set priority
function setPriority(message) {
  return {
    message: message,
    priority: 1
  };
}

// filter encript data
function encripty(data) {
  data.encripted = true;
  return data;
}

// helper to capitalize strings
function capitalize(nome) {
  return nome.charAt(0).toUpperCase() + nome.toLowerCase().slice(1);
}

// filter to capitalize message
function capitalize_message(data) {
  data.message = capitalize(data.message);
  return data;
}

// pipe to set priority
function pipe_setPriority(data_source){
  return data_source.map(setPriority);
}

// pipe to encripty message
function pipe_encripty(pipe) {
  return pipe.map(encripty);
}

// pipe to capitalize
function pipe_capitalize_message(pipe) {
  return pipe.map(capitalize_message);
}

console.log(pipe_capitalize_message(pipe_encripty(pipe_setPriority(incoming_messages))));

console.log(incoming_messages.map(setPriority).map(encripty).map(capitalize_message));