Compose function decorator that takes data and subsequent functions and returns a function that composes callbacks right to left. Uses "pipe" function from pipe.js (my gist) and Underscore.js

compose-left.js

var nums = [1, 2, 3, 4, 5];

function sum(numList) {
  return numList.reduce(function(memo, num) {
    return memo + num
  }, 0)
}

function double(num) {
  return num * 2
}

function square(num) {
  return num * num
}

function cons(newItem, coll) {
  return [newItem].concat(coll)
}

function pipe() {
  var data = _.first(arguments);
  var fns = _.rest(arguments);
  var fn = _.first(fns);
  if (!_.isUndefined(fn)) {
    var newData = fn(data)
    return pipe.apply(this, cons(newData, _.rest(fns)))
  }
  return data
}

function compose() {
  var fns = _.toArray(arguments);
  return function(data) {
    return pipe.apply(this, cons(data, fns))
  }
}

var sumDoubleSquareList = compose(sum, double, square);

console.log(sumDoubleSquareList(nums));