code: function inputPipes (pipe, taskKey) {
    var pipes = []
  
    function pushPipe (key) {
      pipes.push(pipe[key])
    }
  
    function ifIsInputPipe (key) {
      return pipe[key][1] === taskKey
    }
  
    Object.keys(pipe).filter(ifIsInputPipe).forEach(pushPipe)
  
    return pipes
  }
docs: Compute pipes that feed a task.
  
  @param {Object} pipe
  @param {String} taskKey
  
  @returns {Array} pipes